Final answer:
The contra-revenue account to sales revenue for returns and allowances is called sales returns and allowances.
Step-by-step explanation:
The contra-revenue account to sales revenue for returns and allowances is called sales returns and allowances. This account is used to record the reduction in sales revenue due to returns or allowances granted to customers.
For example, if a customer returns a defective product and receives a refund, the amount of the refund will be recorded as a deduction in the sales returns and allowances account.