Question

I only need the first one ( 45% of 30) but please keep in mind that I do need help with the other two, but they are optional.

Answer 1

45%=.45=45/100
take 45/100 * 30 = 45*30/100
Honestly you can leave it as a fraction since it is rational and all rationals can be represented as a/b
repeat process for 2 and 3

Answer 2

45% of 30 is 13.5
40% of 175 is 70
20% of 60 is 12