Every month the Incredible Ice Cream Shop sends a card with a coupon for a free ice cream treat to the members of their ice cream club who were
born in that month. The number of members and their birthday month is
shown below
The manager of the ice cream shop noticed that 90% of all club
members brought along a family member who spent an average
of $18 in the shop. The tax on their bill was 5.5%.
a.
What was the total amount spent by the family members in one
year?
b.
What would each family member have to spend, on average, to
generate $5,000 in income before sales tax?
c.
What would each family member’s average bill be with sales
tax?