Question

A shopkeeper gains 20% while buying the goods and 30% while selling them find his total gain percent​

Answer 1

Answer:

profit=selling price_buying price

30-20=10

=10%

Answer 2

Let sp =x

Cp = x×100 by 100+20

cp=x×100 by 120

cp=5x\6

shopkeeper sell the goods to the customer

so, cp= x and gain =30%

sp= x(100+30) by 100

sp= 13x\10

gain =13x\10 - 5x\6

gain= 14x\30

gain% = 14x\30 ×100by 5x\6= 56%

The formula to solve this question

x+- y+- xy\100

20+30+ 20×30\100

50+600\100=56%