Question

find simple interest if principal=500,rate=10%,time=3year

Answer 1

SI = P×R×T/ 100
=500×10×3/100
= 5×10×3
= 50×3
=150 is the simple intrest

Answer 2

HEYA!
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$simple \: interest \: = \frac{p \times r \times t}{100} \\ \\ = > \frac{500 \times 10 \times 3}{100} \\ \\ = > \frac{15000}{100} \\ \\ = > 150$
Hence , Simple Interest SI = 150 Rs.

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