PSLE A company offered 100 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 100 speakers were sold in the first five days of the sale?
- During the sale, the discounted price of the speakers was $78. After the sale, the remaining speakers were sold without discount. What was the total amount of money collected from selling all 100 speakers?
(a)
The steepest line is from Day 1 to Day 2.
On Day
2, the most number of speakers was sold.
(b)
Number of speakers that were left at Day
5 = 35 Number of speakers that were sold for the first five days = 100 - 35 = 65 Percentage of speakers that were sold for the first five days
=
65100 x 100%
= 65%
(c)
Number of speakers that were left at the end of the sale = 15
Number of speakers that were sold during the sale
= 100 - 15
= 85
Total amount that collected from the speakers sold
= 85 x 78
= $6630
Price of each speaker after 40% discount
= 100% - 40%
= 60%
60% of the price = 78
1% of the price = 78 ÷ 60 = 1.3
100% of the price = 100 x 1.3 = 130
Amount collected from selling the remaining speakers
= 15 x 130
= $1950
Total amount collected from selling all the 100 speakers
= 6630 + 1950
= $8580
Answer(s): (a) Day
2; (b) 65%; (c) $8580