A sum of money is lent at S.I. for 6 years. If the same amount is paid at 4% higher, Arun would have got Rs. 120 more. Find the principal
This means, simple interest at 4% for that principal is Rs.120
$\text{P} = \dfrac{100 \times \text{SI}}{\text{RT}} = \dfrac{100 \times 120}{4 \times 6} = \dfrac{100 \times 30}{6} = 100 \times 5 = 500$
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