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2 years ago

7

Last week, the price of apples at a grocery store was $1.60 per pound. This week, apples at the same grocery store are on sale a

t a 10% discount. What is the total price of 4 \frac{ 1}{2 }
2
1

pounds of apples this week at the grocery store?

1 answer:

Tatiana [17]2 years ago

5 0

Answer:

The new price for one pound of apples is $1.44

Step-by-step explanation:

A 10% discount from $1.60 is $0.16, which can be found by multiplying $1.60 by 0.10. To figure out the new price, use the equation: $1.60 - $0.16= $1.44

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Step-by-step explanation:

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Putting T(t) =138°C and t= 18 minutes

$138=230 -Ae^{-k\times 18}$

$\Rightarrow -Ae^{-18k}=138-230$

$\Rightarrow Ae^{-18k}=92$ .....(1)

Again after 36 minutes it is 184°C

Putting T(t) =184°C and t= 36 minutes

$184=230-Ae^{-k\times 36}$

$\Rightarrow Ae^{-36k}=230-184$

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$ln e^{-18k}=ln\frac{46}{92}$

$\Rightarrow -18k =ln (\frac12)$

$\Rightarrow -18k= ln1-ln2$

$\Rightarrow k= \frac{ln2 }{18}$

Putting the value k in equation (1)

$Ae^{-18\frac{ln2}{18}}=92$

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$\Rightarrow A= 92 \times 2$

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Therefore $k= \frac{ln2 }{18}$ , A=184

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