A sports shop had 400 ping pong balls for sale. Each ping pong ball is sold at $5. 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 $11 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
= 400 - 48 - 36 - 45
= 271
Fraction of ping pong balls left at the end of Day 3
=
271400=
271400 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 33 + 51 + 39
= 123
Amount that it would collect if it sold the 123 ping pong balls at the original price
= 123 x 5
= $615
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 $11
= 41 x 11
= $451
Amount that it would collect less from the sale of the ping pong balls
= 615 - 451
= $164
Answer(s): (a)
271400; (b) $164