Question

\(x+15\%.x=115\)

Answer 1

\(\Leftrightarrow x+\frac{3}{20}x=115\)

\(\Rightarrow x\left(1+\frac{3}{20}\right)=115\)

\(\Rightarrow x\cdot\frac{23}{20}=115\)

\(\Rightarrow\frac{23x}{20}=115\Rightarrow115\cdot20=23x\)

=>2300=23x

=>x=2300:23

=>x=100

Answer 2

x(1+15%) = 115

x.23/20 = 115

x = 115 : 23/20 = 100