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 five days of the sale?
- During the sale, the discounted price of the lamps was $54. 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 1 to Day 2.
On Day
2, the most number of lamps was sold.
(b)
Number of lamps that were left at Day
5 = 100 Number of lamps that were sold for the first five days = 200 - 100 = 100 Percentage of lamps that were sold for the first five days
=
100200 x 100%
= 50%
(c)
Number of lamps that were left at the end of the sale = 70
Number of lamps that were sold during the sale
= 200 - 70
= 130
Total amount that collected from the lamps sold
= 130 x 54
= $7020
Price of each lamp after 10% discount
= 100% - 10%
= 90%
90% of the price = 54
1% of the price = 54 ÷ 90 = 0.6
100% of the price = 100 x 0.6 = 60
Amount collected from selling the remaining lamps
= 70 x 60
= $4200
Total amount collected from selling all the 200 lamps
= 7020 + 4200
= $11220
Answer(s): (a) Day
2; (b) 50%; (c) $11220