He has $3 in total
Mommy told him that he has $3 means he has 3 chance to play since each play needs 1 token equal to $1
Then, he carefully chooses what he wants to play and decides to play bear eating apple and uses up another $1
If saving, he can play and buy more sweets, if playing, he can play but get nothing, if buying ice cream, he will get ice cream and may have some coins left
Then there are options to choose
Vanilla or chocolate, vanilla cost $0.80 means he still get 20cent change to be kept in his box or chocolate cost $1 and left with nothing