PSLE A company offered 100 lamps at 30% 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 100 lamps were sold in the first five days of the sale?
- During the sale, the discounted price of the lamps was $35. After the sale, the remaining lamps were sold without discount. What was the total amount of money collected from selling all 100 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 = 35 Number of lamps that were sold for the first five days = 100 - 35 = 65 Percentage of lamps that were sold for the first five days
=
65100 x 100%
= 65%
(c)
Number of lamps that were left at the end of the sale = 15
Number of lamps that were sold during the sale
= 100 - 15
= 85
Total amount that collected from the lamps sold
= 85 x 35
= $2975
Price of each lamp after 30% discount
= 100% - 30%
= 70%
70% of the price = 35
1% of the price = 35 ÷ 70 = 0.5
100% of the price = 100 x 0.5 = 50
Amount collected from selling the remaining lamps
= 15 x 50
= $750
Total amount collected from selling all the 100 lamps
= 2975 + 750
= $3725
Answer(s): (a) Day
2; (b) 65%; (c) $3725