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Interest — Maths STD 7 — Question

Maharashtra BoardEnglish MediumSTD 7MathsInterest3 Marks
Question
Find the time when:
Principal = Rs. 5200, S.I. = Rs. 975 and time $=2\frac12\text{ years}.$
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Answer

Principal (P) = Rs. 5200
S.I. = Rs. 975
$\text{Time(t)}=2\frac12=\frac52\text{ years}$
$\therefore\text{Rate}=\frac{\text{S.I.}\times100}{\text{P}\times\text{r}}$
$=\frac{975\times100\times2}{5200\times5}$
$=\frac{15}{2}\%$
$=7\frac12\%\text{ p.a.}$

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