Question

A shopkeeper buys 80 kg sugar at the rate of 13.5 per kg he mixes it with the 120 kg sugar of 16 per kg if he expects 20% profit overall then with what rate, he will sell that mixture

Answer 1

A shopkeeper buys 80 kg sugar at the rate of 13.5 per kg 
so cost =80*13.5=1080

he mixes it with the 120 kg sugar of 16 per kg
cost=120*16=1920

now he has 160kg which he had brought for [1080+1920]3000 rupees
he needs 20 % profit
selling price=[c.p*100+profit/100]
                     =[3000*120/100]
 =3600 rupees

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