June turnover = May turnover *( 1+ monthly growth rate) = May turnover+May turnover * monthly growth rate.

May turnover = April turnover *( 1+ monthly growth rate)

As can be seen from the title.

May turnover * monthly growth rate = 18.72

May turnover =78*( 1+ monthly growth rate)

78*( 1+ monthly growth rate) monthly growth rate = 18.72

(1+ monthly growth rate) monthly growth rate =0.24.

Monthly growth rate+monthly growth rate * monthly growth rate -0.24=0

(Monthly growth rate+1.2) (Monthly growth rate -0.2)=0

Solve, get

Monthly growth rate =- 1.2 or 0.2

According to the title, the monthly growth rate is positive.

Therefore, the monthly growth rate =0.2.

June turnover = May turnover *( 1+ monthly growth rate)

= April turnover *( 1+ monthly growth rate) *( 1+ monthly growth rate)

=78*( 1+0.2)*( 1+0.2)

= 1 12.32

So the turnover in June was 1 123200 yuan.