If the USA dollar becomes cheap by 12% over its original cost and the cost of German mark increased by 20%, what will be the gain? (The selling price is not altered.)
Explanation:
Let CP = 100 Current gain = 20 ⇒ SP = 120 CP = Cost of A + Cost of B + other = 30% + 50% + 20%
New cost of A = 30 + 20% of 30 = 36 New cost of B = 50 – 12% of 50 = 44 New CP = 36 = 44 + 20 = 100 Gain = 20%
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