A sports shop had 500 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
= 500 - 42 - 45 - 60
= 353
Fraction of ping pong balls left at the end of Day 3
=
353500=
353500 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 39 + 54 + 30
= 123
Amount that it would collect if it sold the 123 ping pong balls at the original price
= 123 x 3
= $369
Number of sets of 3 ping pong balls
= 123 ÷ 3
= 41
Amount that it would collect if it sold the 123 ping pong balls at every 3 ping pong balls at $5
= 41 x 5
= $205
Amount that it would collect less from the sale of the ping pong balls
= 369 - 205
= $164
Answer(s): (a)
353500; (b) $164