# ISEE Middle Level Math : How to find percentage

## Example Questions

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### Example Question #161 : Percentage

A plane ticket is on sale for 25% its original price of \$300.00. What is the sale price of the plane ticket?

Explanation:

First, multiply:

Then, subtract that amount from the original price:

Answer: The plane ticket is on sale for

### Example Question #162 : Percentage

A large box contains some balls, each of which is marked with a number; one ball is marked with a "1", two balls are marked with a "2". and so forth up to ten balls with a "10".

What percent of the balls are marked with an even number? Give the closest answer.

Explanation:

The number of balls in the box, in total, will be

balls,

of which

are even.

This is

This makes 55% the correct choice.

### Example Question #163 : Percentage

What percent of the above figures are triangles?

Explanation:

Of the fifteen figures, three are triangles - that is,  of the figures are triangles. This is

of the figures.

### Example Question #164 : Percentage

What percent of the above figures have been shaded in?

Explanation:

Of the fifteen figures, seven have been shaded in -  of the figures, or

, so this is .

### Example Question #165 : Percentage

The above parallelogram has been divided into triangles of equal size. What percent of the parallelogram has been shaded in?

Explanation:

18 of 24 triangles have been shaded in; this is  of the parallelogram, which is equal to

of the parallelogram.

### Example Question #166 : Percentage

is 25% of .

is 125% of .

is what percent of ?

Explanation:

Assume ; this reasoning is independent of the actual value.

is 25% of , or, equivalently, .

is 125% of , or, equivalently, .

To determine what percent  is of , evaluate:

### Example Question #167 : Percentage

is 30% of .

is   of .

is what percent of ?

Explanation:

30% of a number is equal to  of that number.

Therefore,

, and

of a number is equal to  of the number, so

To determine what percent  is of , evaluate:

### Example Question #168 : Percentage

is  of

is  of .

is what percent of  ?

Explanation:

This reasoning is independent of the value of , so for simplicity's sake, we will assume that ; the reason for this selection will be apparent later.

is  of , or

of ; this is

Similarly,

is  of , or

of ; this is

.

To determine what percent  is of , evaluate:

### Example Question #169 : Percentage

A sweater that usually costs  is on sale for  off. How much does the sweater cost during the sale?

None of these