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anastassius [24]
3 years ago
11

A cell phone charger costs $21. There is a 10% discount this week only. The sales tax is 9%. What is the total of the phone char

ger including tax? Please show your work.
Mathematics
1 answer:
Alex17521 [72]3 years ago
5 0

Answer:

The total charge of phone charger after discount and including tax = $20.60

Step-by-step explanation:

Given as :

The cost of cell phone charger = $21

The discount on phone charger = 10%

The sales tax includes = 9%

Now, As the discount is 10% then the cost of phone charger after discount =

        $21 - (10% of $21)

Or, cost after discount = $21 - (\frac{210}{100})

Or, cost after discount = $21 - $2.1

Or, cost after discount = $18.9

Now the sales tax of 9% added after discount

So , Final price of phone charger = $18.9 + 9% of $18.9

Or, Final price of phone charger = $18.9 + 0.09 × $18.9

I.e Final price of phone charger = $18.9 + $1.701 = $20.60

Hence the Final price of phone charger after discount and sales tax is $20.60    Answer

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A circular path 4 feet wide has an inner diameter of 550 feet. How much farther is it around the outer edge of the path than aro
Softa [21]

Answer:

L_c=25.12ft

Step-by-step explanation:

From the question we are told that

Width of circular path w_c=4ft

Inner Diameter d_i_n=550ft

Outer diameter d_{out}= 550 +2*4  (inner diameter +  2 circular path width)

d_{out}= 550 +8\\d_{out}= 558ft

Generally the equation for inner circumference of the circle C_1 is mathematically given by

C_1=\pi d_{in}

C_1=3.14*550

C_1=1727ft

Generally the equation for outer circumference of the circle C_2 is mathematically given by

C_2=\pi d_{out}

C_2=3.14*558

C_2=1752.12ft

Generally the difference in length of the two circumference L_c is mathematically given by

L_c=C_2-C_1

L_c=1752.12-1727

L_c=25.12ft

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