₹6,000 becomes ₹7,200 in 4 years at a certain

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₹6,000 becomes ₹7,200 in 4 years at a certain rate of simple interest. If the rate becomes 1.5 times of itself, the amount of the same principal in 5 years will be

SI = Amount - Principle = (7200 – 6000) = 1200

∴ SI =	Principal × Time × Rate
	100

⇒ 1200 =	6000 × 4 × R
	100

⇒ R =	1200 × 100	= 5%
	6000 × 4

New rate of R = 5 × 1.5 = 7.5%

Then, SI =	6000 × 7.5 × 5
	100

SI = ₹2250
∴ Amount = Principle + SI = (6000 + 2250) = ₹8250