Question

Which of the purchases would be the least expensive?

Purchase
Amount of sale
Sales tax rate
A
$150
5%
B
$145
7%
C
$140
8%
D
$135
9%

purchase A
purchase B
purchase C
purchase D

Answer 1

Ok first u need to find price of each purchase.


(5%) (Divided) by (100)


\[5\div100=0.05\]

Now (Multiply) (0.05) by (150)

\[0.05\times150=7.5\]

Last (Add) (7.5) to (150)


\[150+7.5=157.5\]


(157.5) is also know as (157.50)

Option A: (157.50)


Lets (Divide) (7%) by (100)


\[7\div100=0.07\]

Now (Multiply) (0.07) by (145)


\[0.07\times145=10.15\]

Lastly (Add) (10.15) and (145)

\[145 + 10.15 = 155.15\]

Option B: (155.15)

Now (Divide) (8) by (100)

\[8\div100=0.08\]

Lets (Multiply) (0.08) by (140)


\[0.08\times140=11.2\]

Finally lets (Add) (11.2) and (140)

\[140+11.2=151.2\]

(151.2) is also known as (151.20)

Option C: (151.20)

First u wanna (Divide) (9%) by (100)

\[9\div100=0.09\]

Lets (Multiply) (0.09) by (135)

\[0.09\times135=12.15\]

Lastly (Add) (12.15) to (135)


\[135+12.15=147.15\]

Option D: (147.15)

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Option A: (157.50)


Option B: (155.15)


Option C: (151.20)


Option D: (147.15)


As we can see Option D is the (Lowest) price out of all of the Options.
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Option D is the correct,least expensive purchase.