The number of watches sold in Town Y in April = 210
The number of watches sold in Town X in April = 150
Required percentage
$$\eqalign{
& = \frac{210-150}{150}\times100 \cr
& = \frac{60}{150}\times100 \cr
& =40\% \cr} $$
2.
The number of watches sold in Town X in July was 10% more than the number of watches sold in the same town in May. What is the ratio of the number of watches sold in July to that sold in January in the same town?
Number of watches sold in Town X in the month of May = 180
Number of watches sold in Town X in the month of July
= $$\frac{180\times110}{100}$$
= 198
Number of watches sold in Town X in the month of January = 120
∴ Required ratio
$$\eqalign{
& = \frac{198}{120} \cr
& = \frac{33}{20} \cr
& = 33:20\cr} $$
3.
What is the average number of watches sold in Town X in January, February, March and June?
Number of Watches sold in Town Y in February = 120
Number of Watches sold in Town Y in May = 230
Required percentage increase
$$\eqalign{
& = \frac{230-120}{120}\times100 \cr
& = \frac{110}{120}\times100 \cr
& = \frac{110\times5}{6}\cr
& = \frac{275}{3} \cr
& = 91\frac{2}{3}\% \cr} $$
5.
What is the difference between the total number of watches sold in both the towns together in June and the total number of watches sold in both the towns together in March?
Total number of watches sold in both the towns together in the month of June
= 240 + 180
= 420
Total number of watches sold in both the towns together in March
= 180 + 150
= 330
Required difference
= 420 - 330
= 90