Question
Amit invested 'x' on simple interest at 12% for 7 years
and (x + 400) on compound interest at 10% p.a for 2 years. At the end of nine years, he will received a total interest of Rs.1,344 then find the value of 'x'?Solution
ATQ, {x [[1 + (12 × 7)/100] - 1] } + { (x + 400) [[1 + (10/100)]2 _ 1] }= 1344 on sloving we get x = Rs.1200
If n(A) = 25, n(B) = 40 and n(A ∪ B) = 50, then n(A ∩ B) equals
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