Mortage hypo loan

The Jonáš family decided to buy an older apartment, which cost EUR 30,000. They found EUR 17,000 and took the loan with the bank for the remaining amount. What interest did they receive if they repay this amount for 15 years at EUR 120 per month?

Correct result:

p =  7.4307 %


a=3000017000=13000 eur n=15 12=180 s=120 eur  b=n s=180 120=21600 Eur  s=a qn (q1)qn1  120=13000 q180 (q1)q1801 q>0 q=1.00619222430451.0062 p1=q1=1.006210.0062 p2=12 p1=12 0.00620.0743   p=100 p2=100 0.0743=7.4307%

Equation is non-linear.
Equation is not quadratic.

The real roots of the equation:

q1 = -0.970616824448
q2 = 1.0061922243

Our simple equation calculator calculates it.

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