Answer:
$75
Explanation:
The following operations represent an increase in cash on the balance sheet: issuing common stock and cash flows from operating activities.
The following operations represent a decrease in cash on the balance sheet: reducing notes payable and purchasing fixed assets.
Since the initial balance was $100, the balance at the end of 2018 is:
[tex]B=\$100+\$450+\$315-\$40-\$750\\B=\$75[/tex]
ABC Inc. has $75 on its balance sheet at the end of 2018.