75%×1/4×1/4+4/5×1/2=..... Pakai cara......

75% x 1/4 x 1/4 + 4/5 x 1/2
= 75/100 x 1/16 + 4/10
= 75/1600 + 4/10
= 75/1600 + 640/1600
= 1390/1600
= 139/160

semoga membantu :)