The notebook

After rising by 40%, the notebook cost 10.50 euros. How much did this notebook cost if it increased in price by only 20% instead of 40%?

Correct result:

x =  9 Eur


k1=40%=1+40100=1.4 k2=20%=1+20100=1.2    k1 c=10.50 1.4 c=10.50  1.4c=10.5  c=152=7.5  x=k2 c=1.2 7.5=9 Eur

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