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The simple interest on Rs. 1820 from March 9, 2003 to May 21, 2003 at 7 1⁄2% rate is

Rs. 27.30
Rs. 22.50
Rs. 28.80
Rs. 29
Explanation:

$\text{Time, T = (22 + 30 + 21)days = 73 days = }\dfrac{73}{365}\text{ year} = \dfrac{1}{5}\text{ year}$

$\text{Rate, R = }7\dfrac{1}{2}\% = \dfrac{15}{2}\%$

$\text{SI = }\dfrac{\text{PRT}}{100} = \dfrac{1820 \times \dfrac{15}{2} \times \dfrac{1}{5}}{100} = \dfrac{1820 \times \dfrac{3}{2} }{100} = \dfrac{910 \times 3}{100} = \dfrac{2730}{100}=27.30$

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