PSLE A company offered 80 speakers at 20% 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 $128. 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 = 44
Number of speakers that were sold for the first four days
= 80 - 44
= 36
Percentage of speakers that were sold for the first four days
=
3680 x 100%
= 45%
(c)
Number of speakers that were left at the end of the sale = 28
Number of speakers that were sold during the sale
= 80 - 28
= 52
Total amount that collected from the speakers sold
= 52 x 128
= $6656
Price of each speaker after 20% discount
= 100% - 20%
= 80%
80% of the price = 128
1% of the price = 128 ÷ 80 = 1.6
100% of the price = 100 x 1.6 = 160
Amount collected from selling the remaining speakers
= 28 x 160
= $4480
Total amount collected from selling all the 80 speakers
= 6656 + 4480
= $11136
Answer(s): (a) Day 3; (b) 45%; (c) $11136