my stupid maid II~

my parents use to keep coins and some small amounts of notes like RM1 in a cupboard for my maid to stock up some bread everyday when the motor-bread-seller comes by our house. my dad thought her to buy a RM2.30 bread with 4 x 50cents + 1 x 20cents + 1 x 10cents. today, when i came home from school, she came and said: " x'cuse me Yani, money no enough buy roti. " showing me 2 x 50cents + 1 x 20cents + 1 x 10cents. i spilled my wallet and found an RM1 note and gave it to her. and guess what she told me, she said my note cant buy the bread. she needs another 2 x 50cents. and then i went to the cupboard, and found out that it was pilled with coins and notes. and then i know she ran out of 50cents, that's why she said money not enough. urrgh... i don't know when can i get to show this girl how to count money or any other thing she doesn't know. i've spent hours teaching her the coins. she learn't them, but she doesn't even know

RM0.20+RM0.1o=_?_

she is real real real real stupid.