A rougher bank has $4$ cells connected in series. The feed to the circuit has a mass rate of $1000$ t$/$hr and a grade of $2\%$ copper. The recoveries and grades for the individual cells down the bank is presented in the table below: Based on the data provided, estimated cumulative recovery and grade for the rougher cell.

Rougher $1$ Rougher $2$ Rougher $3$ Rougher $4$

Grade $(\%)30251810$

Recovery $(\%)35302520$

$($i$)$ Plot a grade recovery curve for the rougher cells based on the date provided $($ii$)$ What is the cumulative recovery and grade for the rougher cells?