A sports shop had 500 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 3? Express your answer in its simplest form.
- If the shop decided to sell every 3 ping pong balls at $1 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 - 54 - 60 - 54
= 332
Fraction of ping pong balls left at the end of Day 3
=
332500=
83125 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 45 + 51 + 51
= 147
Amount that it would collect if it sold the 147 ping pong balls at the original price
= 147 x 2
= $294
Number of sets of 3 ping pong balls
= 147 ÷ 3
= 49
Amount that it would collect if it sold the 147 ping pong balls at every 3 ping pong balls at $1
= 49 x 1
= $49
Amount that it would collect less from the sale of the ping pong balls
= 294 - 49
= $245
Answer(s): (a)
83125; (b) $245