the sum of money amounts to rupee 780 in 2 years and a Rupee 1230 in 7 years find the principal and rate of simple interest
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principal= Rs.600, r=15% .
per every year SI is same .
7th year amount - 2nd year amount difference is equal to 5 years SI .
per every year SI is same .
7th year amount - 2nd year amount difference is equal to 5 years SI .
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