Refrigerator - discount

The refrigerator was first discounted by 20% and then increased in price by 5%. Now the Zmrzlin family bought it for 420 euros. How much was the refrigerator before the discount?

Final Answer:

a =  500 eur

Step-by-step explanation:

b=420 eur  a r1 r2 = b  r1=100%20%=110020=0.8 r2=100%+5%=1+1005=1.05  r=r1 r2=0.8 1.05=2521=0.84  a r=b  a=rb=0.84420=500 eur



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