A wholesale dealer earns a profit of 20% by selling watches to a retailer. The retailer makes a profit of 30% by selling it to customers. What is the cost of the dealer for a watch that is sold by retailer for Taka 312?
Solution
Correct Answer: Option B
Dealer এর cost x টাকা হলে , in 20% profit , price =(x+x X 20/100)=x+x/5= 6x/5 when cost 6x/5 then if profit 30% then cost =6x/5+( 6x/5 X 30/100)= 6x/5+18X/50 here, 6x/5+6x+5+18X/50=312 or, x = 200
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