Similar calculations can be used to find the population PL in less developed countries after 5 years. Let us first calculate the population PR in 5 years in the richer countries What will be the world population in 5 years if we assume that these rates of increase will stay constant for the next 5 years. Out of a world population of approximately 6.6 billion, 1.2 billion people live in the richer countries of Europe, North America, Japan and Oceania and is growing at the rate of 0.25% per year, while the other 5.4 billion people live in the lees developed countries and is growing at the rate of 1.5%. How much did he have to repay (principal + interest) at the Tom borrowed $600 at 10% per year, simple interest, for 3 years. The interest earned at the end of 5 years is Substitute P1 by 2000(1 + 5%) found above to findĬontinuing with this process, it can easily be shown that a the end of the 5th year, the principal is given by How much interest did she earn at the end of the 5 year period?Īt the of the first year, she has the principal plus the interest on the principalĪt the of the second year, she has the principal P1 plus the interest on P1 Janette invested $2000 at 5% compounded annually for 5 years. Total interest at the end of the two year period is How much interest did he earn at the end of the two year period? For the first year, the rate of interest was 7% and the second year it was 8.5%. The 10% discount will be on the already reduced price, hence the price of the second shirt is given by How much would one pay for two shirts at this shop? If someone buys 2 shirts, he will be offered a discount of 15% on the first shirt and another 10% discount on the reduced price for the second shirt. Total paid = $30 + 9.5% * 30 + 10% * 30 = $35.85Ī shop is offering discounts on shirts costing $20 each. They paid for food, sales tax and tip, hence They also had to pay 9.5% sale tax and 10% for the tip. In absolute term, the percent decrease is less than the percent increase.Ī family had dinner in a restaurant and paid $30 for food. Percent decrease from 40 to 30 is given by Percent increase from 30 to 40 is given by Compare the percent of increase from 30 to 40 and that of the decrease from 40 to 30. Part / whole = (250 - 150) / 250 = 0.4 = 40%Ī number increases from 30 to 40 and then decreases from 40 to 30. The percentage decrease fro the original price 250 to 150 is given by We first need to find the original price x. What is the percent of decrease from the original price to the final price of $150? Then later the price decreased again from $200 to $150. The price of an item decreased by 20% to $200. The part were the same in both cases but the whole was smaller in the second decrease. The second decrease was larger in percent term. Which of the two decreases was larger in percentage term? Then later the price decreased again from $100 to $80. The price of an item changed from $120 to $100. Substitute y by 0.22 x in the equation x - y = 30 and solve for x which the original price.Ĭheck the solution to this problem by reducing the origonal price found $38.5 by 22% and see if it gives $30. Let x be the original price and y be the absolute decrease. What was the original price of the trousers? The price of a pair of trousers was decreased by 22% to $30. Multiply and divide 0.23 by 100 to convert in percent Percent = part / whole = 280 / 1200 = 0.23 (rounded to 2 decimal places) The part of her salary that is spent on food is $280 out of her monthly salary of $1200 What percent of her monthly salary does she spend on food? Multiply and divide 0.25 to obtain percent. The percent decrease is the absolute decrease divided by the the original price (part/whole). What is the percent decrease of the price of this shirt. Several word problems on percentage with detailed solutions are presented.
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