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2013-07-17T19:31:03+02:00

a) 20 - 25% * 20 = 20 - 25/100 * 20 = 20 - 5 = 15

 

b) 50 - 20% * 50 = 50 * 20/100 * 50 = 50 - 10 = 40

 

c) 200 - 1% * 200 = 200 - 1/100 * 200 = 200 - 2 = 198

2013-07-17T19:31:53+02:00

A

x=20-(25%z20)=20-(0,25*20)=20-5=15

 

B

x=50-(20%z50)=50-0,2*50=50-10=40

 

C

x=200-(1%z200)=200-0,01*200=200-2=198