A sports shop had 350 tennis balls for sale. Each tennis ball is sold at $3. At the end of each day, the number of tennis balls sold was recorded in the bar graph shown.
- What fraction of the total number of tennis balls was left at the end of Day 3? Express your answer in its simplest form.
- If the shop decided to sell every 3 tennis balls at $7 from Day 4 onwards, how much less would it collect from the sale of the tennis balls?
(a)
Number of tennis balls left at the end of Day 3
= 350 - 33 - 42 - 54
= 221
Fraction of tennis balls left at the end of Day 3
=
221350=
221350 (b)
Number of tennis balls sold from Day 4 to Day 6
= 51 + 57 + 51
= 159
Amount that it would collect if it sold the 159 tennis balls at the original price
= 159 x 3
= $477
Number of sets of 3 tennis balls
= 159 ÷ 3
= 53
Amount that it would collect if it sold the 159 tennis balls at every 3 tennis balls at $7
= 53 x 7
= $371
Amount that it would collect less from the sale of the tennis balls
= 477 - 371
= $106
Answer(s): (a)
221350; (b) $106