Elinor is asked to invest $5100 in a friend's business with the promise that the friend will repay $5610 in one year. Eleanor finds her best alternative to this investment, with similar risk, is one that will pay her $5508 in one year. U. S. securities of similar term offer a rate of return of 7%. What is the opportunity cost of capital in this case

the opportunity cost of capital in this case is 8%

Explanation:

From the information given :

Elinor is asked to invest $5100 in a friend's business with the promise that the friend will repay $5610 in one year.

Eleanor finds her best alternative to this investment, with similar risk, is one that will pay her $5508 in one year.

U.S. securities of similar term offer a rate of return of 7%.

The opportunity cost of capital can be determined by using the expression:

where;

A = amount = $5508

P = Principal = $5100

r = opportunity cost of capital  = ???

n = number of years = 1 year

1.08 × 100 = 100 + r

108 = 100 + r

r = 108 - 100

r = 8%

Therefore; the opportunity cost of capital in this case is 8%

b. take periodic breaks and alternate between tasks.  

will increase work efficiency, and avoid health issues.