Sandra's father gave her $4 * 2 = $<<4*2=8>>8.
So Sandra has in total $8 + $4 + $10 = $<<8+4+10=22>>22.
She wants 14 candies, so she is going to pay 14 candies * $0.50/candy = $<<14*0.5=7>>7 for them.
She wants also 20 jellybeans, and they're going to cost 20 jellybeans * $0.20/jellybean = $<<20*0.2=4>>4.
So after the purchase, she will be left with $22 - $4 - $7 = $<<22-4-7=11>>11.
#### 11