The normal gasoline mileage of a car is 28 mpg. On a smooth road its mileage is 12% higher. What is it's milage on a smooth road?

Question

The normal gasoline mileage of a car is 28 
mpg. On a smooth road, its mileage is 12% higher. What is its mileage on a smooth road? Round your answer to the nearest tenth.

Answer 1

Loren,

 

It helps to think of a simpler problem. Let's say mpg is 20 and 10% higher on a smooth road.

 

How many miles will you get with one gallon on a regular road?

 

How many more miles will you get on a smooth road? 10% more, right? How much is that?

 

OK - so you've now solved a simpler problem. Use the exact some process to solve your, more complicated, problem.

 

Best of luck,

Bryce

Answer 2

12% = .12     .....28 x .12 ( or 12% of 28) =3.36   its higher on a smooth road so add 3.36 to 28 to get 31.36 rounded to 31.4