Silven produces two models of cell phones with the following expected activity demands: 1. Determine the total overhead assigned to each product using the four activity drivers. in proportion to their costs. Round interim calculations to two decimal places and round your final answers to the nearest dollar. Silven produces two models of cell phones with the following expected activity demands: 1. Determine the total overhead assigned to each product using the four activity drivers. in proportion to their costs. Round interim calculations to two decimal places and round your final answers to the nearest dollar