It costs Rupee $1$ to photocopy a sheet of paper. However, a $2\%$ discount is allowed on all photocopies done after the first $1000$ sheets. The discount increases to $5\%$ for all photocopies exceeding $2500$ sheets. How much will it cost to copy $5000$ sheets of paper?

1. A
   $\text{Rs. }4845$
2. B
   $\text{Rs. }4870$
3. C
   $\text{Rs. }4920$
4. D
   None of the above