8) The electricity costs of a business increased from $10,000 one year to $13,000 the next. To the nearest whole percent, what was the rate of increase?

9) Write the ratio of 9 nickels to 3 quarters in simplest form.

10) Garrett washes 3 cars in 72 minutes. How many minutes does it take Garrett to wash one car?

11) Determine whether the pair of fractions is proportional:

12) Write a proportion that is equivalent to the statement: If 3 gallons of gasoline cost $5.37 then 8 gallons will cost $14.32.

Elementary math problems. ... This solution covers elementary math problems dealing with result unknown, change unknown, start unknown, part unknown, whole unknown. ...

Math problem solving. Read the below problem and come up with ways to solve that problem. ... This solution helps with a problem about math problem solving. ...

Real World Math Problems with Percentages. ... Please see the attachment for the solutions. Real world math problems with percentages are determined. ...