fro 25ii., i worked out that there would be a 3/5 chance to win $4, which would mean
5 X 12 = 60, so 3 X 12 = 36. 36 X $4 = $144. but to lose $8 = 1/5 chance, 1 X 12 = 12.
$8 X 12 = $96, 144 - 96 = $ 48 so she won $48 in total.
For 25iii. i figured that now she had
to win 3/6 = 30 X $4...