Work out a flexible budget for overhead expenses on the basis of the following data available and

determine overhead rates at $70\%,80\%$ and $90\%$ capacity levels

At $80\%$ capacity level

Variable overhead:

Indirect materials

Indirect labor

Semi$-$variable overheads:

Power $(70\%$ variable$)$

Repairs and maintenance $(60\%$ fixed$)$

Fixed overhead:

Depreciation

Insurance

Others

Estimated direct labor hours

$144,000$

$64,000$

$200,000$

$50,000$

$36,000$

$16,000$

$108,000$

$240,000$ hours