Problems on Percentage

x

Option: B

Explanation

first convert percentage into fraction

i.e) 4% = 4/100 = 1/25

0.6% = 0.6/100 = 6/1000 = 3/500

Ans = 1/25, 3/500

x

Option: C

Explanation

First convert percentage into fractions

i.e) 21% = 21/100

0.08% = 0.08/100

Now convert those fractions into decimal

i.e) 21/100 = 0.21

0.08/100 = 0.0008

Ans = 0.21, 0.0008

x

Option: D

Explanation

8 can be expressed as 2³

125 can be expressed as 5³

i.e) {(2/5)³}^-4/3

(2/5)^{3*(-4/3)}

(2/5)^-4

(5/2)⁴

Ans = 625/16

x

Option: B

Explanation

First convert percentage into fraction

i.e) 28% = 28/100

45% = 45/100

i.e) 28% of 450 + 45% of 280 =[((28/100) * 450) + ((45/100) * 280)]

126 + 126 = 252

Ans = 252

x

Option: C

Explanation

To find whether the given number is how much percent of another given number

Divide the number given with the estimated number(the number for which how much percent is to be found)

i.e) (2/50)

Now convert it into percentage

i.e) ((2/50) * 100)% = ((1/25) * 100)% = 4%

Ans = 4%