A sports shop had 450 ping pong balls for sale. Each ping pong ball is sold at $3. 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 3 ping pong balls at $5 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
= 450 - 45 - 39 - 33
= 333
Fraction of ping pong balls left at the end of Day 3
=
333450=
3750 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 42 + 57 + 57
= 156
Amount that it would collect if it sold the 156 ping pong balls at the original price
= 156 x 3
= $468
Number of sets of 3 ping pong balls
= 156 ÷ 3
= 52
Amount that it would collect if it sold the 156 ping pong balls at every 3 ping pong balls at $5
= 52 x 5
= $260
Amount that it would collect less from the sale of the ping pong balls
= 468 - 260
= $208
Answer(s): (a)
3750; (b) $208