Question
A certain sum placed at simple interest grows to Rs.
9,450 in 2 years and Rs. 13,050 in 6 years. Find the invested amount.Solution
ATQ,
Interest earned in 4 years = 13,050 - 9,450 = Rs. 3,600
Interest earned in 2 years = (3,600 / 4) × 2 = Rs. 1,800
So, amount invested = 9,450 - 1,800 = Rs. 7,650
Find the exact value of cos120°
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