Question

Find the simple Interest and Amount

(a) Principal = $ 640 Rate = 12¹/₂% p.a. Time = 1 year

Answer 1

Step-by-step explanation:

P=640

R=12 1/2%p.a=25/2%p.a

T=1yr.

S.I=P×R×T/100

=640×25×1/100×2

=RS.80

A=P+I

=640+80

=720

Answer 2

$\blue{\bold{\underline{\underline{Answer:}}}}$

$\green{\therefore{\text{Simple\:interest=80\:dollars}}}$

$\green{\therefore{\text{Amount=720\:dollars}}}$

$\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}$

$\green{ \underline \bold{Given : }} \\ : \implies \text{Time (t)= 1\:year} \\ \\ : \implies \text{Principal(p) =\ 640} \\ \\ : \implies \text{Rate(r) = 12.5\%} \\ \\ \red{ \underline \bold{To \: Find: }} \\ : \implies \text{Simple\:interest(S.I) = ?}$

• According to given question :

$\bold{As \: we \: know \: that } \\ \circ \: \text{Simple \: interest} = \frac{ \text{Principal }\times \text{ Rate} \times \text{Time}}{100} \\ \\ \bold{Putting \: given \: values} \\ : \implies S.I = \frac{p \times r \times t}{100} \\ \\ : \implies S.I = \frac{640\times 12.5\times1}{100} \\ \\ : \implies S.I = \frac{64\times12.5}{10} \\ \\ \green{ : \implies \text{S.I= \ 80}} \\ \\ \green{ \therefore \text{Simple\:interest =180\: dollars}} \\ \\ :\implies Amount=S.I+principal\\\\ \green{:\implies\text{Amount=80+640=720\:dollars}} \\ \bold{Basic \: formula\:related\:to\:C.I} \\ \circ \: A = p(1 + \frac{r}{100} )^{t}$