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True [87]
3 years ago
15

A restraunt earns $1073 on Friday and $1108 on Saturday. Write and solve an equation to find the amount x (in dollars) the restr

aunt needs to earn on Sunday to average $100 per day over the three- day period. Write your equation so that the units on each side of the equation are dollars per day.
Mathematics
1 answer:
Sveta_85 [38]3 years ago
4 0
For this case, the average is the sum of the amounts of the three days divided by three.

We know the earn of Friday and Saturdar. We can assign x to the earn of saturday.

Promedio= \frac{1073USD + 1108USD + xUSD}{3} =100 USD

Promedio= \frac{2181USD + xUSD}{3} =100 USD

We need to multiply by 3 both sides of the equation.

3(\frac{2181USD + xUSD}{3}) =3(100 USD)

2181 USD + x USD =300 USD

We need to substrat 2181 USD in both sides.

2181 USD - 2181 USD + x USD =300 USD - 2181 USD 

x USD =300 USD - 2181 USD 

x USD = - 1881 USD

They need a negative earn in order to have an average earn of 100 USD per day. 

1073 USD + 1108 USD - 1881 USD = 300 USD

300 USD / 3 = 100 USD [tex]2181 USD - 2181 USD+ xUSD =3100 USD - 2181 USD[/tex]

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Answer:

La señora María debe pagar 463.635 guaraníes por concepto de intereses,

Step-by-step explanation:

Se recomienda utilizar el modelo de interés compuesto puesto que la tasa de interés es constante y periódico, dado que se conoce el monto a pedir prestado, la tasa de interés y el número de anualidades, se obtiene el monto final. La cantidad de dinero a pagar es la diferencia entre ese resultado y el monto a ser prestado.

El modelo de interés compuesto es representado por la siguiente fórmula:

C(t) =C_{o}\cdot (1+r)^{t} (1)

Donde:

C_{o} - Cantidad de dinero a prestar, medida en guaraníes.

r - Razón de interés interanual, adimensional.

t - Anualidad, medida en años.

C(t) - Cantidad de dinero asociada a la anualidad actual, medida en guaraníes.

Si sabemos que C_{o} = 5.000.000, r = 0.03 y t = 3, entonces la cantidad de dinero asociada al término del período de préstamo es:

C(3) = 5.000.000\cdot (1+0.03)^{3}

C(3) = 5.463.635

Finalmente, la cantidad de dinero a pagar por concepto de intereses es:

\Delta C = 5.463.635-5.000.000

\Delta C = 463.635

La señora María debe pagar 463.635 guaraníes por concepto de intereses,

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