Biweekly repayment, 52 weeks per year 1 day (26 biweekly plus 1 day), 30 years is 26*30+2=782 biweekly, which is the total repayment period. The annual interest rate is 4. 15%, and the biweekly interest rate is 4. 15%/26. Under the condition of equal repayment of principal and interest, biweekly contributions are:

350000*4. 15%/26*( 1+4. 15%/26)^782/[( 1+4. 15%/26)^782- 1]=783.87

Explanation: 782 is 782 power.