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Varvara68 [4.7K]
3 years ago
14

A smartphone costs ​$120. Sales tax is 5​%. What is the total​ cost, including​ tax?

Mathematics
1 answer:
miv72 [106K]3 years ago
3 0

Since 100% = $120,

105% = $126.

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Let x and y be the two positive numbers. -  Their product is 192: x *  y  =  192   equation 1

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<span>From the first equation, y =  192 / x. 
Substitute that into the second equation:
</span>
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</span>f(x) is minimum when f'(x) = 0 and f"(x) > 0 

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<span>1-384  / x^2 =  0 

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