Step-by-step explanation:

The simple interest is calculated as :
S.I = P*T*R
where S.I is the simple interest to be calculated
P = Principal
T = Time period in years
R = Annual interest rate
The the above problem,
Amount borrowed which would be the principal (P) = $400
Time period = 6 months = 1/2 year
Annual interest rate = 6.8% = 6.8/100 = 0.068
Simple Interest = P*T*R
Simple Interest = 400*1/2*0.068 = 200 *0.068
Simple Interest = $13.6
The simple interest amount that Miguel must pay to Julio at the end of six months is $13.6
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The domain are the required input for a given function, while the range are the output or result from the function.
7/8*8/9 = (7*8)/(8*9)
Since we have an 8 both above and below, we can erase it, and so the answer is 7/9