0)At what rate of interest a certain sum will be doubled in 8 years?�

1.	0)At what rate of interest a certain sum will be doubled in 8 years?
Answer» Answer : At 12.5% rate of interest sum will be doubled in 8 years!! ⠀⠀━━━━━━━━━━━━ Given : Time = T = 8 years Solution : LET US assume that, Principal = P SI = P ALSO, We know that, SI = PTR / 100 By using the above formula, $\sf \dashrightarrow \: \: \: Rate = \dfrac{100 \times P }{8 \times P} \\ \\ \\ \sf \dashrightarrow \: \: \: \dfrac{100}{8} \\ \\ \\ \sf \dashrightarrow \: \: \:{ \underline{ \boxed{ \sf{ \blue{ \: 12.5 \: per \: annum. }}}}} \: \bigstar$ Therefore, at 12.5% rate of interest sum will be doubled in 8 years!! ⠀⠀━━━━━━━━━━━━ $\boxed{\begin{minipage}{7 cm}\boxed{\underline{\underline{\bigstar\:\bf\:Extra\:Brainly\:knowlegde\:\bigstar}}}\\\\1) Profit = SP - CP\\\\2) Loss = CP - SP\\\\3) Profit\% = (Profit in Rs.)100/CP\\\\4) Loss\% = (Loss in Rs.)100/CP\\\\5) SP = CP(100+P\%)/100\\\\6) SP = CP(100-L\%)/100\\\\7) CP = SP100/(100+P\%)\\\\8) CP = SP100/(100-L\%)\\\\9) Discount =MP - SP\\\\10) Discount\%=(Discount in Rs.)100/MP\\\\11) SP = MP(100-D\%)/100\\\\12) MP = SP*100/(100-D\%)\\\\\end{minipage}}$

0)At what rate of interest a certain sum will be doubled in 8 years?

Answer»

Answer :

At 12.5% rate of interest sum will be doubled in 8 years!!

⠀⠀━━━━━━━━━━━━

Given :

Time = T = 8 years

Solution :

LET US assume that,

Principal = P

SI = P

ALSO,

We know that,

SI = PTR / 100

By using the above formula,

$\sf \dashrightarrow \: \: \: Rate = \dfrac{100 \times P }{8 \times P} \\ \\ \\ \sf \dashrightarrow \: \: \: \dfrac{100}{8} \\ \\ \\ \sf \dashrightarrow \: \: \:{ \underline{ \boxed{ \sf{ \blue{ \: 12.5 \: per \: annum. }}}}} \: \bigstar$

Therefore, at 12.5% rate of interest sum will be doubled in 8 years!!

⠀⠀━━━━━━━━━━━━

$\boxed{\begin{minipage}{7 cm}\boxed{\underline{\underline{\bigstar\:\bf\:Extra\:Brainly\:knowlegde\:\bigstar}}}\\\\1) Profit = SP - CP\\\\2) Loss = CP - SP\\\\3) Profit\% = (Profit in Rs.)*100/CP\\\\4) Loss\% = (Loss in Rs.)*100/CP\\\\5) SP = CP*(100+P\%)/100\\\\6) SP = CP*(100-L\%)/100\\\\7) CP = SP*100/(100+P\%)\\\\8) CP = SP*100/(100-L\%)\\\\9) Discount =MP - SP\\\\10) Discount\%=(Discount in Rs.)*100/MP\\\\11) SP = MP*(100-D\%)/100\\\\12) MP = SP*100/(100-D\%)\\\\\end{minipage}}$