Carcass wrote:

Find the following.

(a) 40% of 15

(b) 150% of 48

(c) 0.6% of 800

(d) 15 is 30% of which number?

(e) 11 is what percent of 55?

(a) 6 (b) 72 (c) 4.8 (d) 50 (e) 20%

(a) 40% of 15

40% of 15 = (40/100)(15) = 600/100 =

6or...

40% of 15 = (0.4)(15) =

6or....

10% of 15 = 1.5

So, 20% of 15 = 3

So, 40% of 15 =

6--------------------------------------------------

(b) 150% of 48

150% of 48 = (150/100)(48) = (3/2)(48) =

72or...

150% of 48 = (1.5)(48) =

72 or...

100% of 48 = 48

So, 50% of 48 = 24

So, 150 of 48 = 48 + 24 =

72 --------------------------------------------------

(c) 0.6% of 800

0.6% of 800 = (0.6/100)(800) = (6/1000)(800) = 4800/1000 =

4.8or...

0.6% of 800 = (0.006)(800) =

4.8 or...

1% of 800 = 8

So, 0.1% of 800 = 0.8

So, 0.6% of 800 =

4.8--------------------------------------------------

(d) 15 is 30% of which number?

Rewrite as: 30% of x = 15

Rewrite as: (30/100)x = 15

Simplify: 0.3x = 15

Solve: x = 15/0.3 = 150/3 =

50--------------------------------------------------

(e) 11 is what percent of 55?

Rewrite as: x% of 55 = 11

Rewrite as: (x/100)(55) = 11

Simplify: 55x/100 = 11

Multiply both sides by 100 to get: 55x = 1100

Solve: x = 1100/55 = 220/11 =

20%
_________________

Brent Hanneson – Creator of greenlighttestprep.com

Sign up for my free GRE Question of the Day emails