A sports shop had 350 ping pong balls for sale. Each ping pong ball is sold at $2. At the end of each day, the number of ping pong balls sold was recorded in the bar graph shown.
- What fraction of the total number of ping pong balls was left at the end of Day 3? Express your answer in its simplest form.
- If the shop decided to sell every 4 ping pong balls at $6 from Day 4 onwards, how much less would it collect from the sale of the ping pong balls?
(a)
Number of ping pong balls left at the end of Day 3
= 350 - 64 - 68 - 68
= 150
Fraction of ping pong balls left at the end of Day 3
=
150350=
37 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 72 + 72 + 76
= 220
Amount that it would collect if it sold the 220 ping pong balls at the original price
= 220 x 2
= $440
Number of sets of 4 ping pong balls
= 220 ÷ 4
= 55
Amount that it would collect if it sold the 220 ping pong balls at every 4 ping pong balls at $6
= 55 x 6
= $330
Amount that it would collect less from the sale of the ping pong balls
= 440 - 330
= $110
Answer(s): (a)
37; (b) $110