11. Какая процентная ставка была начислена на задолженность? - процентная ставка не была начислена, потому что задолженность была выплачена полностью в конце прошлого месяца.
11. What is the interest rate on debts accrued? -the interest rate has not been charged, because the debt has been paid in full at the end of last month.
11. What is the interest rate has been calculated on the debt? - The interest rate was not assessed because the debt was paid in full at the end of last month.