45.Rs 4000 earns Rs 720 as simple interest at 9%. Find the time period.
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pricipal=4000
interest=720
rate= 9%
NOW
SIMPLE INTEREST = P*T*R/100
720 = 4000*T*9/100
720 = 360T
720/360 = T
2 = T
HENCE, TIME = 2 YRS
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