Let's begin by listing out the information given to us:
PTA has 180 soda packs to sell = 180 soda packs
Each pack of soda cost $9.99 = $9.99 /soda
PTA sold 95 packs of soda before school = 95 soda packs
To find how much money the PTA collected after school, we will have to find the number of soda packs sold after school
To get the number of soda packs sold after school, subtract the number of soda packs sold before school from the total number of soda packs.
Mathematically,
Number of soda packs sold after school = 180 - 95 = 85 soda packs
How much money did the PTA collect when selling sodas after School = Number of soda packs sold after school * Cost of each soda pack
= 85 * 9.99 = $849.15