=60÷ 120%,

=50 yuan.

A: The purchase cost of fashionable summer clothes in April was 50 yuan.

(2)40×( 1+20%)

=40× 120%,

=48 yuan.

A: The retail price in May is 48 yuan.

(3)200÷30≈7 (set)

A: In April, shopping malls sold about 7 sets of fashionable summer clothes every day.

(4)40×20%×300.

=8×300,

=2400 yuan.

A: In May, the mall made a profit of 2,400 yuan by selling fashionable summer clothes.