PSLE A company offered 200 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 200 lamps were sold in the first four days of the sale?
- During the sale, the discounted price of the lamps was $36. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 200 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 = 80
Number of lamps that were sold for the first four days
= 200 - 80
= 120
Percentage of lamps that were sold for the first four days
=
120200 x 100%
= 60%
(c)
Number of lamps that were left at the end of the sale = 30
Number of lamps that were sold during the sale
= 200 - 30
= 170
Total amount that collected from the lamps sold
= 170 x 36
= $6120
Price of each lamp after 10% discount
= 100% - 10%
= 90%
90% of the price = 36
1% of the price = 36 ÷ 90 = 0.4
100% of the price = 100 x 0.4 = 40
Amount collected from selling the remaining lamps
= 30 x 40
= $1200
Total amount collected from selling all the 200 lamps
= 6120 + 1200
= $7320
Answer(s): (a) Day 3; (b) 60%; (c) $7320