An amount is first discounted by 20% and then discounted again by 12.5%. What is the single discount in %?
A
20
B
30
C
28
D
25
Correct Answer: 30
Short Cut technique A + B + AB/100 = - 20 - 12.5 + ( - 20)× ( - 12.5)/100 = - 32.5 + 2.50 = - 30