By selling two transistors for Rs600, each a shopkeeper gains 20 percent on one transistor and loses 20 percent on the other. Find : profit or loss percent on the whole.
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Solution
Let the cost price be x1 for the transistor gaining 20%:
20% gain ⟹x1+20x1100=600
1.2x1=600⟹x1=500
Let the cost price be x2 for the transistor losing 20%:
20% loss ⟹x2−20x2100=600
0.8x2=600⟹x2=750
So,
Total C.P of both the transistors =x1+x2=500+750=₹1250