Lao Gao was away on business and failed to repay the principal and interest of the loan in time. What does this belong to on the IOU?

Suspicious loans refer to loans issued by banks, credit cooperatives and other institutions to users or individuals, and the interest and repayment date are agreed. Loans in a broad sense refer to loans, discounts, overdrafts and other borrowing funds. Lao Gao was away on business and failed to repay the principal and interest of the loan in time, which belongs to the suspicious loan in the loan form. Principal and interest is a financial term, "principal" refers to principal and "interest" refers to interest, so principal and interest refers to the sum of principal and interest.