ITPEC IP October 2019 Question 55
ITPEC IP October 2019 — Question 55 of 100
Adding Mr. B increases the total cost by 200 thousand yen. Originally, Mr. A completes 36 / 6 = 6 weeks of work, costing 6 x 300 = 1,800 thousand yen. Mr. B produces three programs per week, so together they produce nine; the work takes 36 / 9 = 4 weeks and costs 4 x (300 + 200) = 2,000 thousand yen. The difference is 2,000 - 1,800 = 200 thousand yen.
Answer (c)
Why not others:
- the shorter duration does not create a cost decrease because both workers are paid during all four weeks
- an increase of 1,200 thousand yen ignores the reduction from six weeks to four
Key rule: Compare total costs as duration multiplied by the combined weekly cost, after recalculating duration from combined productivity.
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