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Can someone help me understand why you can simply add the 10% yearly increase to the 30% yearly decrease? For example, for the first year why couldn't we multiply 1,200 by (.70+.10)?
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Can someone help me understand why you can simply add the 10% yearly increase to the 30% yearly decrease? For example, for the first year why couldn't we multiply 1,200 by (.70+.10)?

Adding 0.70 + 0.10 means we are getting 80% or 1200*0.8 = 960 Rs. as interest and not 120 Rs., which is the correct interest.

Solving such questions using correct steps in sequence is the key.
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