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FromTheMoon [43]
3 years ago
14

The Jayden family eats at a restaurant that is having a 15% discount promotion. Their meal costs $78.40 before the discount, and

they leave a 20% tip. If the tip applies to the cost of the meal before the discount, what is the total cost of the meal? Round your intermediate calculations and answer to the nearest cent.
Mathematics
2 answers:
weqwewe [10]3 years ago
7 0

Answer:

$ 80.22

Step-by-step explanation

Assumed 20% tip is on the discounted meal.The cost of the meal is $78.65

The cost of the meal after discount (15%)is 78.65(1−0.15)≈$ 66.85

Tip (20%) is : 66.85⋅0.2$13.37

Total cost of the meal is

66.85+13.37≈$80.22 [Ans]

ryzh [129]3 years ago
5 0

Answer:

Total Cost = (85% * 78.65) + (20% * 78.65)

= 105% * 78.65

= 1.05 * 78.65

= $82.58

Step-by-step explanation:

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The correct answer is y= 0.513(1.833)^x


Explain


We will use the equation on this form

Y=ab^x

Let’s us plug in the coordinates of first point

(X, y) , ( 9, 120)

We will have

Y=ab^x

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Our equation for a will be

Ab^9 = 120

ab ^9 / b^9 = 120/ b^9


a = 120/ b^9

So will have


Y= 120/ b^9 • b^x

Then we will plug in coordinates for the second point


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We will have

Y= 120/b^9 • b^x

220 = 120/b^9 • b^10-9


220= 120b

Divide both side by 120

B= 11/6

B= 1.833333 = 1.833



Let’s plug in the value b=11/6 to our equation for a


A= 120/b^9

A= 120/ 11/6^9

A= 120/11^9/6^9


A=120 • 6^9 / 11^9

= 0.51285 which equal to 0.513



So therefore the answer is

Y= 0.513(1.833)^x


I hope this help you

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