Find the percent of increase from to .

Find the percent of increase from to .

Last week, a case of water cost $4.00. This week, it is on sale for $3.00 a case. Find the percent decrease.

Oscar brought 72 cookies to a company picnic. By picnic's end there were only 7 cookies left. By what percentage did Oscar's batch of cookies decrease?

Your weekly allowance went from $40 to $30 a week. Find the percent decrease in your allowance.

For your 16th birthday, your parents have decided to help you buy a car. The car you want costs $2500. Your parents said they would contribute $700 toward the purchase price of the car. What was the percent decrease in the price you have to pay for the new car after their contribution?

There are 3000 people enrolled in a specific program in 2003. Between 2003 and 2004, the number of people enrolled increases by 12%, and between 2004 and 2005, 65 people unenroll. How many people are enrolled at the beginning of 2005?

Kerri wanted to make a chart to calculate how much time she was spending on studying for her tests. For her midterm, she charted that she spent 1 hour and 30 minutes studying every day for three days. Since she was grasping the material, for the final exam Kerri only studied 3 hours total. What is the percent change for the amount of time studying between the midterm and final exam?

Last week, a case of water cost $4.00. This week, it is on sale for $3.00 a case. Find the percent decrease.

Charlie bought stock initially valued at . Unfortunately, Charlie's stocks depreciated to a value of . By what percent did Charlie's stocks depreciate?