A sports shop had 450 ping pong balls for sale. Each ping pong ball is sold at $4. 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 $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
= 450 - 52 - 72 - 44
= 282
Fraction of ping pong balls left at the end of Day 3
=
282450=
4775 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 56 + 56 + 76
= 188
Amount that it would collect if it sold the 188 ping pong balls at the original price
= 188 x 4
= $752
Number of sets of 4 ping pong balls
= 188 ÷ 4
= 47
Amount that it would collect if it sold the 188 ping pong balls at every 4 ping pong balls at $11
= 47 x 11
= $517
Amount that it would collect less from the sale of the ping pong balls
= 752 - 517
= $235
Answer(s): (a)
4775; (b) $235