PSLE A company offered 80 speakers at 40% discount during a 7-day sale. The line graph shows the number of speakers left unsold at the end of each day.
- On which day was the most number of speakers sold? Give your answer in this format. (Eg Day 1)
- What percentage of the 80 speakers were sold in the first four days of the sale?
- During the sale, the discounted price of the speakers was $12. After the sale, the remaining speakers were sold without discount. What was the total amount of money collected from selling all 80 speakers?
(a)
The steepest line is from Day 2 to Day 3.
On Day 3, the most number of speakers was sold.
(b)
Number of speakers that were left at Day 4 = 40
Number of speakers that were sold for the first four days
= 80 - 40
= 40
Percentage of speakers that were sold for the first four days
=
4080 x 100%
= 50%
(c)
Number of speakers that were left at the end of the sale = 8
Number of speakers that were sold during the sale
= 80 - 8
= 72
Total amount that collected from the speakers sold
= 72 x 12
= $864
Price of each speaker after 40% discount
= 100% - 40%
= 60%
60% of the price = 12
1% of the price = 12 ÷ 60 = 0.2
100% of the price = 100 x 0.2 = 20
Amount collected from selling the remaining speakers
= 8 x 20
= $160
Total amount collected from selling all the 80 speakers
= 864 + 160
= $1024
Answer(s): (a) Day 3; (b) 50%; (c) $1024