Question

Diameter of a bangle is $7cm$. Thin stripe of gold is to be fixed on this bangle, find the cost(in Rs) for it at the rate of $Rs.100$ per $1cm$.

Answer 1

Given: Diameter of bangle $\left(d\right)=7cm$

$\Rightarrow$ Radius of bangle $\left(r\right)=\frac{d}{2}=\frac{7}{2}cm$

Labour charges to fix thin stripe of gold on bangle $=Rs.100$ per $cm$.

Therefore, Total Labour charges $=Rs.100\times 2\pi r$

$=Rs.[100\times 2\times \frac{22}{7}\times \frac{7}{2}]$

$=Rs.2200$