Finding a Percent of a Number Answers

Each hour, the number of bacteria in Dr. Nall’s petri dish tripled. What percent is the population compared to the population the hour before?

Aarti posted a comment on her blog. Each day the number of responses to her comment was 125% of the number she received on the previous day. If there were 64 responses the first day, how many were there on the fourth day?

Joelle would like to tip her hairdresser 20%. If her haircut costs $38.00, which expression should she use to find the tip amount?

Maria studied the traffic trends in India. She found that the number of cars on the road increases by 10% each year. If there were 80 million cars in year 1 of her study, how many more cars were on the road in year 3 compared to year 2?

In a recent flu epidemic, the number of flu cases increased by 40% each week. There were 3,000 flu cases during the first week of January. How many more people were affected by the flu during the third week of January than during the first week?

If Adam orders a book from Store X, how much will he owe to the nearest cent? The tax rate only applies to the cost of the book.Comparison of Online Bookstores Store XStore YCost of book$17.00$18.00Tax rate6%8%Shipping10% of cost of the bookFREE

If Zöe orders a book from Store Y, how much tax will she pay?Comparison of Online Bookstores Store XStore YCost of book$17.00$18.00Tax rate6%8%Shipping10% of cost before taxFREE

Charissa is eating out with friends, and it is her turn to pay the gratuity. The bill for the food is $26.50. If she plans to tip at 20%, what should she pay if she doesn’t want to leave pennies on the table?

Andrew and Kate have $30 to spend on dinner, tax, and gratuity at Mo’s Restaurant. Tax is 6%, and they will give a 15% tip on the total bill after taxes. Their dinner costs $21.00. Which statement correctly explains whether Andrew and Kate have enough money to pay their bill?

If Jaime wants to find 60% of 320, which table should he use?