I was trying to see why the highlighted responses was incorrect?

Cash balance, December 1, 2016 is $18,900 Transactions Dec. 1 The owner contributed an additional $7,800 cash to the business in exchange for capital 7 Purchased equipment for $1,700 on account. 14 Paid $20,000 cash for land. 17 Paid cash expenses: office rent, $1,400; employees' salaries, $1.500; utilities, 560. 23 The owner withdrew $2,300, 26 Earned service revenue for the month $5,000, receiving cash. SMART TOUCH LEARNING Statement of Cash Flows Month Ended December 31, 2016 Cash flows from operating activities Receipts: Collections from customers 5000 Payments: For rent -1400 For salaries -1500 -60 -2960 Net cash provided (used) by operating activities 2040 Cash flows from investing activities Acquisition of Land 1700 Net cash provided (used) by investing activities -1700 Cash flows from financing activities Owner contribution 7800 Owner withdrawal 2300 Net cash provided (used) by financing activities 5500 Net increase (decrease in cash 5840 Cash balance, December 1, 2016 18900 Cash balance, December 31, 2016 24,740