PSLE
A company offered 100 juicers at 20% discount during a 7-day sale. The line graph shows the number of juicers left unsold at the end of each day.

1. On which day was the most number of juicers sold? Give your answer in this format. (Eg Day 1)
2. What percentage of the 100 juicers were sold in the first four days of the sale?
3. During the sale, the discounted price of the juicers was $152. After the sale, the remaining juicers were sold without discount. What was the total amount of money collected from selling all 100 juicers?

(a)
The steepest line is from Day 2 to Day 3.

On Day 3, the most number of juicers was sold.

(b)
Number of juicers that were left at Day 4 = 55

Number of juicers that were sold for the first four days
= 100 - 55
= 45

Percentage of juicers that were sold for the first four days
= ⁴⁵₁₀₀ x 100%
= 45%

(c)
Number of juicers that were left at the end of the sale = 15

Number of juicers that were sold during the sale
= 100 - 15
= 85

Total amount that collected from the juicers sold
= 85 x 152
= $12920

Price of each juicer after 20% discount 
= 100% - 20%
= 80%

80% of the price = 152
1% of the price = 152 ÷ 80 = 1.9
100% of the price = 100 x 1.9 = 190

Amount collected from selling the remaining juicers
= 15 x 190
= $2850

Total amount collected from selling all the 100 juicers
= 12920 + 2850
= $15770

Answer(s): (a) Day 3; (b) 45%; (c) $15770