1 2/5 - 1 4/5 : 0,72 x 75%

1 2/5 - 1 4/5 : 0,72 * 75%
= 7/5 - 9/5 : 72/100 * 75/100
= 7/5 - ( 9/5 * 100/72 * 75/100)
=7/5 - (180/72 * 75/100)
= 7/5 - ( 180/72 * 3/4)
= 7/5 - 45/24
= 168/120 - 225/120
= 57/120 = 19/40

semoga membantu