I need help with the formula to solve the problem below, step for step please.

Activity-Based Costing Using the data above for products S and T, calculate the costs using activity-based costing. Allocate the costs of testing, computing, and development based on the rates of activity consumed by each product's development process. If required in your computations, round per unit costs to the nearest cent. Round your final answers to the nearest dollar. Cost Activity Base Testing Hours of testing Computing cost Units of computing power Developer cost Development hours Product S Product T Testing cost $ 5,280.00 X Testing cost $ 21,120.0 X Computing cost $ 7,920.00 X Computing cost 31,680.0 X Developer cost 220.00 Developer cost 880.00 V Total cost $ 13,400.0 X Total cost 53,680.0 X