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# Find the amount to be paid at the end of 3 years in each case:

$(a)$. Principal$=Rs.\ 1,200$ at $12\ %$ p.a.

$(b)$. Principal$=Rs.\ 7,500$ at $5\ %$ p.a.

$(a)$ Here, Principal $(P)=Rs.\ 1,200$

Rate $(R)=12 \% p.a.$,

Time $(T)=3\ years$

Simple Interest$=\frac{P\times R\times T}{100}$

$=\frac{1200\times12\times3}{100}$

$= Rs.\ 432$

Now, $Amount=Principal+Simple Interest$

$=1200+432$

$=Rs.\ 1,632$

$(b)$ Here, Principal $(P)=Rs.\ 7,500$,

Rate $(R)=5 \% p.a.$,

Time $(T)=3\ years$

$Simple Interest=\frac{P\times R\times T}{100}=\frac{7500\times5\times3}{100}$

$=Rs.\ 1125$

Now, $Amount=Principal+Simple\ Interest$

$=7,500+1,125$

$=Rs.\ 8625$

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