The graph shows the number of cups of bubble tea left unsold in Bobby Bubble Tea shop.

(a)
How many cups of bubble tea were sold from 11 00 to 12 00?

Ans: (a) ___
(b)
The cost of a cup of bubble tea was $3.90. What was the average amount of money received per hour from selling the bubble tea between 12 00 to 15 00?

Ans: (b) ___

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Worked solution

1. Read the number of cups unsold at 11 00 and 12 00 from the graph

At 11 00, unsold cups = $1000$ .
At 12 00, unsold cups = $750$ .

2. Calculate the number of cups sold between 11 00 and 12 00

Cups sold = $1000 - 750 = 250$

Answer

$250$

1. Find the number of cups sold between 12 00 and 15 00

Cups unsold at 12 00 = $750$
Cups unsold at 15 00 = $130$
Number of cups sold = $750 - 130 = 620$

2. Calculate the total amount of money received

Total money received = $620 \times 3.90 = \char36{}2418$

3. Calculate the average amount of money received per hour

Time duration from 12 00 to 15 00 = $3$ hours
Average money per hour = $2418 \div 3 = \char36{}806$

Answer

$806

AI analysis — may contain mistakes.

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