A sports shop had 300 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 4? Express your answer in its simplest form.
- If the shop decided to sell every 3 ping pong balls at $1 from Day 5 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 4
= 300 - 57 - 33 - 39 - 51
= 120
Fraction of ping pong balls left at the end of Day 4
=
120300=
25 (b)
Number of ping pong balls sold from Day 5 to Day 6
= 51 + 45
= 96
Amount that it would collect if it sold the 96 ping pong balls at the original price
= 96 x 2
= $192
Number of sets of 3 ping pong balls
= 96 ÷ 3
= 32
Amount that it would collect if it sold the 96 ping pong balls at every 3 ping pong balls at $1
= 32 x 1
= $32
Amount that it would collect less from the sale of the ping pong balls
= 192 - 32
= $160
Answer(s): (a)
25; (b) $160