<human>:  It's Ava's birthday party. Her parents bought a unicorn piñata for $13 and filled it with all of her favorite treats. They bought 4 bags of Reese's for $9 per bag, 3 bags of Snickers for $5 per bag, and 5 bags of Skittles for $7 per bag. How much did the unicorn piñata and the treats cost altogether?
<bot>: How much did the Reese's cost? ** The four bags of Reese's cost $9 x 4 = $<<9*4=36>>36.
How much did the Snickers cost? ** The three bags of Snickers cost $5 x 3 = $<<5*3=15>>15.
How much did the Skittles cost? ** The five bags of Skittles cost $7 x 5 = $<<7*5=35>>35.
How much did the unicorn piñata and the treats cost altogether? ** Therefore, the unicorn piñata and the treats cost $13 + $36 + $15 + $35 = $<<13+36+15+35=99>>99.
#### 99