WAEC Economics 2015 Paper

Concept:Total utility is the total satisfaction obtained from consuming a given quantity of a good.It is calculated by summing the marginal utilities of all units consumed.Explanation:Marginal utility ($MU$) is the extra utility gained from consuming one additional unit.When you are given the marginal utility at various consumption levels, each value is an addition to total utility.So, total utility ($TU$) is found by adding these marginal utility values together.For example, if the marginal utilities are $MU_1$, $MU_2$, and $MU_3$, then:$$TU = MU_1 + MU_2 + MU_3$$This process is simply addition, not subtraction, multiplication, or division.Therefore, to calculate total utility from given marginal utility levels, add the marginal utilities.Answer:B. Add $MU$ from the various levels.