During an accounting period, a business sells goods on credit for a total selling price of £6,000. At the start of the accounting period, there are trade receivables (debtors) of £900. At the end of the accounting period, there are trade receivables (debtors) of £500. What is the amount that will appear in the statement of cash flows as cash inflow from customers?

(a) £5,800

(b) £6,400

(c) £6,700

(d) £6,900