Effective Rate of Return

[Sr Accountant]

I am trying to find the effective rate of return on a loan as follows:

PV $100,000
Life = 10 yrs
First 3 yrs = No Payments
Next 7 yrs = $1,460.86

If I calculate over just 7 years I get 6%, but how do I find the effective
rate of return over the life of the loan?

Thanks!