An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
A current of 15.0 A for 30 seconds results in a total charge of 450 Coulombs. This charge corresponds to approximately 2.81 × 10²¹ electrons flowing through the device. The calculation uses the charge of an electron and the relationship between current, charge, and time.
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To calculate the profit under marginal costing when the company sells 250,000 units, let's break down the steps:
Understand the Elements :
Selling Price per Unit : $10
Variable Cost per Unit : $6
Fixed Costs per Unit for 200,000 Units : $2
Calculate Total Sales Revenue :
Sales Revenue = Selling Price per Unit × Number of Units Sold
Sales Revenue = $10 \times 250,000 = $2,500,000
Calculate Total Variable Costs :
Variable Costs = Variable Cost per Unit × Number of Units Sold
Variable Costs = $6 \times 250,000 = $1,500,000
Calculate Contribution Margin :
Contribution Margin = Sales Revenue − Variable Costs
Contribution Margin = $2,500,000 − $1,500,000 = $1,000,000
Identify Fixed Costs :
Fixed Costs remain constant at the total of 200,000 units × $2 = $400,000
Calculate Profit :
Profit = Contribution Margin − Fixed Costs
Profit = $1,000,000 − $400,000 = $600,000
Thus, under marginal costing, the profit made by the company when it sells 250,000 units is $600,000 .
The chosen multiple choice option is b. $600,000 .
