Answer:
(d) 15 bouquets
Explanation:
it is given that kate alone can arrange 20 bouquets per day
and it is also given that when Kate and his husband William work together then they arrange 35 bouquets
we have to find the William marginal product
if both together arrange 35 bouquets and Kate alone arrange 20 bouquets it means that 35-20=15 bouquets are arranged by William alone
so the marginal product of William is 35-20=15 so the option will be the correct answer