Let:
x = amount in the account invested in 2.5%
20000 - x = amount in the account invested in 3%
Solution:
.025x + .03 (20000 - x) = 540
.025x + 600 - .03x = 540
-.005x + 600 = 540
-.005x = 540 - 600
-.005x = -60
x = 12000
Therefore, that person invests 12,000 at 2.5%
and
20,000 - 12,000 = 8,000 at 3%
Answer: Option A
Explanation: In simple words, Variable cost is that cost of the business that changes with level of production. Hourly wage rate of workers, electricity bill of factory are some of many examples of variable cost.
The electricity consumption is fixed per unit, but if the level of production rises the electricity bill also rises as more units will be consumed.
Hence, from the above we can conclude that the right option is A.
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Marginal utility will be calculated for movies by: 14/(4*4) which would mean 0.875 utils per dollar per movie. Whereas, for apps, it would be: 8/(3*4) which would mean utils per dollar per app to be 0.667. Hence, movies tend to carry higher utility.