Two discounts 2

A shirt that has printed price EUR 150, is sold at EUR 105 after two successive discounts. If the second discount is 12.5% then find the first discount.

Correct answer:

p1 =  20 %

Step-by-step explanation:

a=150 EUR b=105 EUR r2=100%12.5%=110012.5=0.875  r=ab=150105=107=0.7  r=r1 r2  r1=r/r2=0.7/0.875=54=0.8  p1=100 (1r1)=100 (10.8)=20%

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