(a) To calculate the level of output per period for which the total costs are the same for the two methods of production, we can set the total costs of each method equal to each other and solve for output.
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Total cost of Method X = Total cost of Method Y
(5,500,000 + 535x) = (8,260,000 + 420y)
535x = 8,260,000 - 5,500,000
535x = 2,760,000
x = 5,144
Therefore, the level of output per period for which the total costs are the same for the two methods of production is 5,144 units.
(b) The number of units produced in the period is given as 5,144 units.
(c) The total costs of Methods X and Y at the level of output in (b) above are as follows:
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Method X:
Total cost = (5,500,000 + 535 * 5,144) = £29,078,440
Method Y:
Total cost = (8,260,000 + 420 * 5,144) = £34,055,680
As you can see, the total cost of Method X is lower than the total cost of Method Y at the level of output in (b) above. This is because Method X has lower variable costs than Method Y.