Answer:
xxx = 20%
Step-by-step explanation:
No. of people who saw the advert on television:
At the beginning of the first month = 800
Monthly increase = 200
At the beginning of the third month = 1,200 (800 + 200 * 2)
If 240 more people saw the advert on the internet than on television at the beginning of the third month,
This implies that, at the beginning of the third month, 1,440 (1,200 + 240) saw the advert on the internet, increasing from 1,000 the previous two months.
Therefore, the rate increase in two months = 1,440/1,000 = 1.44
and the square root of 1.44 = 1.2
xxx = 0.2 (1.2 - 1) = 20%
