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borishaifa [10]
3 years ago
15

Jamie's parents own a hardware store. They asked Jamie to put the retail prices on an order of hammers that was just delivered.

The wholesale cost of each hammer is $8.50. The store markup is 60%. What retail price will Jamie put on each hammer?
Mathematics
1 answer:
swat323 years ago
7 0

Answer:

Retail price of  each hammer is $ 13.60

Step-by-step explanation:

Given -

Whole sale cost of each hammer is   $8.50

Whole sale price means the discounted price of each hammer at the time of purchase.

Retails price is the selling price marked on each hammer which is marked up by 60 % on the whole sale price

As we know that

Marking up the price of any commodity by X % above its retails price means charging a price X% higher than the cost of the good or service

Retail price of one hammer

(Whole sale price of one + 60 % * Whole sale price of one hammer)

Substituting the given values in above equation, we get-

8.50 + \frac{60}{100} * 8.50\\= 8.50 + 0.60 * 8.50\\= 13.6

Retail price of  each hammer is $ 13.60

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Answer:

Generally the barrier width is a = 1.9322 *10^{-9} \ m

Step-by-step explanation:

From the question we are told that

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       The electron energy is  E = 0.08eV

Generally the wave number is mathematically represented as

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Here m is the mass of the electron with the value  m  =  9.11 *10^{-31} \  kg

         h  is is know as h-bar and the value is  \= h = 1.054*10^{-34} \  J \cdot s

So

          k  =  \sqrt{ \frac{2 * 9.11 *10^{-31 } [0.4 - 0.04] * 1.6*10^{-19}}{[1.054*10^{-34}^2]} }

=>      k = 3.073582 *10^{9}  \ m^{-1}

Generally the tunneling probability is mathematically represented as

          T  = 16 * \frac{E}{V_o }  * [1 - \frac{E}{V_o} ] * e^{-2 * k * a}

So

        1.0 *10^{-5} = 16 * \frac{0.04}{0.4 }  * [1 - \frac{0.04}{0.4} ] * e^{-2 * 3.0736 *10^{9} * a}

=>    6.944*10^{-6}= e^{-2 * 3.0736 *10^{9} * a}

Taking natural log of both sides

          ln[6.944*10^{-6}] = -2 * 3.0736 *10^{9} * a}

=>        -11.8776  = -2 * 3.0736 *10^{9} * a}

=>        a = 1.9322 *10^{-9} \ m

       

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