$($a$)$ The Standard Cost of Actual Consumption is 8$,000$ and Actual Cost of Actual Consumption if 8$,600$ where as the standard cost of a product if Rs$.7,100.$ Calculate Material Price and Usage Variance.

$($b$)$ The Standard price of a material is Rs$.$5 per kg and the actual price is Rs$.5.90$ per kg$.$

If Material Price Variance is $4,000($F$),$ then calculate Actual Quantity of Material consumed.