PSLE
A company offered 200 sandwich makers at 10% discount during a 7-day sale. The line graph shows the number of sandwich makers left unsold at the end of each day.

1. On which day was the most number of sandwich makers sold? Give your answer in this format. (Eg Day 1)
2. What percentage of the 200 sandwich makers were sold in the first five days of the sale?
3. During the sale, the discounted price of the sandwich makers was $108. After the sale, the remaining sandwich makers were sold without discount. What was the total amount of money collected from selling all 200 sandwich makers?

(a)
The steepest line is from Day 1 to Day 2.

On Day 2, the most number of sandwich makers was sold.

(b)
Number of sandwich makers that were left at Day 5 = 80

Number of sandwich makers that were sold for the first five days
= 200 - 80
= 120

Percentage of sandwich makers that were sold for the first five days
= ¹²⁰₂₀₀ x 100%
= 60%

(c)
Number of sandwich makers that were left at the end of the sale = 50

Number of sandwich makers that were sold during the sale
= 200 - 50
= 150

Total amount that collected from the sandwich makers sold
= 150 x 108
= $16200

Price of each sandwich maker after 10% discount 
= 100% - 10%
= 90%

90% of the price = 108
1% of the price = 108 ÷ 90 = 1.2
100% of the price = 100 x 1.2 = 120

Amount collected from selling the remaining sandwich makers
= 50 x 120
= $6000

Total amount collected from selling all the 200 sandwich makers
= 16200 + 6000
= $22200

Answer(s): (a) Day 2; (b) 60%; (c) $22200