A sports shop had 400 tennis balls for sale. Each tennis ball is sold at $4. 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 4? Express your answer in its simplest form.
- If the shop decided to sell every 5 tennis balls at $18 from Day 5 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 4
= 400 - 50 - 70 - 50 - 85
= 145
Fraction of tennis balls left at the end of Day 4
=
145400=
2980 (b)
Number of tennis balls sold from Day 5 to Day 6
= 95 + 70
= 165
Amount that it would collect if it sold the 165 tennis balls at the original price
= 165 x 4
= $660
Number of sets of 5 tennis balls
= 165 ÷ 5
= 33
Amount that it would collect if it sold the 165 tennis balls at every 5 tennis balls at $18
= 33 x 18
= $594
Amount that it would collect less from the sale of the tennis balls
= 660 - 594
= $66
Answer(s): (a)
2980; (b) $66