tolong................

1 rim = 500 lembar
2,5 rim = 2,5 x 500 = 1250 lembar
untuk ujian = 39/50 x 1250 = 975 lembar

2,5 rim = 25/10 x 500 lembar
= 1250 lembar
yg digunakan
39/50 x 1250 = 39 x 25
= 975 lembar