The production function for good x in the table below exhibits increasing marginal returns to capital over what output range

During the current year, bob's ceramics shop had sales revenue of $60,000, of which $25,000 was on credit. at the start of the current year, accounts receivable showed a $3,500 debit balance, and the allowance for doubtful accounts showed a $300 credit balance. collections of accounts receivable during the current year amounted to $18,000.