please solve and show how, thank you!

Teel Printing uses two measures of actwity, press runs and book set-ups, in the cost formulas in its budgets and performance reports. The cost formula for wages and salaries is $8,850 per month plus $400 per press run plus $950 per book set-up. The company expected its activity in July to be 204 press runs and 111 book set-ups, but the actual activity was 201 press runs and 110 book set-ups The actual cost for wages and salaries in July was $193780 The activity variance for wages and salanies in July would be closest to