The predicted future total cost when sales volume is 375,000 units is $306,300.
The predicted future total cost when sales volume is 415,000 units is $338,300.
The future total cost can be predicted using the high-low method, which determines the variable cost per unit and the total fixed cost.
Taking the total units and cost of two months (highest and lowest):
Month Units Total Costs
7 Highest 362,500 $296,300
9 Lowest 76,500 $67,500
Difference 286,000 $228,800
Variable cost per unit = $0.80 ($228,800 ÷ 286,000)
With the highest units:
Total variable cost = $290,000 ($0.80 x 362,500)
Fixed costs = $6,300 ($296,300 - $290,000)
With the lowest units:
Total variable cost = $61,200 ($0.80 x 76,500)
Fixed costs = $6,300 ($67,500 - $61,200)
Let the number of units sold = x
Let the total cost = y
The equation for total costs, y = 0.8x + 6,300
To predict the total cost when sales volume is 375,000 units and 415,000 is as follows:
Total cost for 375,000 units sold = y = 0.8x + 6,300
y = 0.8(375,000) + 6,300
= $306,300
Total cost for 415,000 units sold = y = 0.8x + 6,300
y = 0.8(415,000) + 6,300
= $338,300