what is 24% of 30, What is 5% of 16?

First one is right, second one is wrong. 5% is 0.05.
16*0.05 gives you 0.8.

100%<--------->30
10%<---------->3
1%<-----------> 0.3

20%<--------->6
4%<---------->1.2

24%<-------->7.2

CHECK
0.24 x 30 = 2.4 x 3 = 7.2


100%<----->16
10%<------->1.6
5%<--------->0.8

CHECK
0.05 x 16 = 0.8

1)
30 x 24%
= 30 x 24/100
= 30 x 6/25
= 180/25
= 7.2

2)
16 x 5%
= 16 x 5/100
= 16 x 1/20
= 16/20
= 4/5 (0.8)

here's an easier way: in algebra, the is means equals to and the of means multiply. so all you have to do is translate the English. Assign a variable to the unknown.

What is 24% of 30=
__x__=.24(30)

What is 5% of 16=
__x__= .05(16)

yes thats right
but 5% is 0.05 so, 0.8
percentun means by hundredths (divide by 100 like your 1st answer)

thats .05, not .5

answer to #2 is 0.8