Percentage

1. 65% of 90.

→ (60 + 5) % of 90

→ 60% of 90

==> (50+10)% of 90

==> 50% of 90 is 45 and 10% of 90 is 9. ==> 45 + 9 ==> 54

==> 60% of 90 is 54.

==> 5% of 90 is 4.5

==> Total is 54 + 4.5 ==> 58.5

→ Hence , The answer is 58.5

2) 27% of 64.

→ (20 + 5 + 2)% of 64.

→ 20% of 64

==> 10% of 64 ==> 6.4

==> 20% of 64 ==> 12.8

==> 5% of 64 ==> 3.2

==> 2% of 64 ==> 1.28

==> Total value is 12.8 + 3.2 + 1.28 ==> 17.28

→ Hence, 27% of 64 is 17.28

3) Find the value of X.

X^1/2 % of 160 = 32

==> 160 * X/ 100 =32

==> X= 20

==> X^1/2 = 400

4) 66% of 350 + ? = 5/8 of 1256.

→ ( 50 + 10 + 5 + 1)% of 350 + X = 1256 * 5 / 7

==> 50% of 350 = 175.

==> 10% of 350 = 35

==> 5% of 350 = 17.5

==> 1% of 350 = 3.5

==> 175 + 35 + 17.5 + 3.5 + X = 157 * 5

==> 231 + X = 785

==> X = 554