Write a C program using the enum user defned data type to calculate the towil electricty bil according to the given cond tion: For first $50$ units Rs $0\mathrm{.}50$ urit

For naxt $100$ units Rs $0\mathrm{.}75$ unit

For next $100$ urits Rs $1\mathrm{.}20$ iunit

For unt above $250$ Rs $1\mathrm{.}50$ unt

An additional surcharge of $20\%$ is added to the bill.

$($SMM$)$