PSLE A company offered 80 lamps at 10% discount during a 7-day sale. The line graph shows the number of lamps left unsold at the end of each day.
- On which day was the most number of lamps sold? Give your answer in this format. (Eg Day 1)
- What percentage of the 80 lamps were sold in the first four days of the sale?
- During the sale, the discounted price of the lamps was $99. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 80 lamps?
(a)
The steepest line is from Day 2 to Day 3.
On Day 3, the most number of lamps was sold.
(b)
Number of lamps that were left at Day 4 = 44
Number of lamps that were sold for the first four days
= 80 - 44
= 36
Percentage of lamps that were sold for the first four days
=
3680 x 100%
= 45%
(c)
Number of lamps that were left at the end of the sale = 24
Number of lamps that were sold during the sale
= 80 - 24
= 56
Total amount that collected from the lamps sold
= 56 x 99
= $5544
Price of each lamp after 10% discount
= 100% - 10%
= 90%
90% of the price = 99
1% of the price = 99 ÷ 90 = 1.1
100% of the price = 100 x 1.1 = 110
Amount collected from selling the remaining lamps
= 24 x 110
= $2640
Total amount collected from selling all the 80 lamps
= 5544 + 2640
= $8184
Answer(s): (a) Day 3; (b) 45%; (c) $8184