Total pool services earned $160,000 of service revenue during 2018. Of the $160,000 earned the business received $140,000 in cach. The remaining amount $20,000 was still owed by customers as of December 31. In addition total pool services incurred $70,000 of expenses during the year. As of December 31, $8000 of the expenses still need to be paid. And addition total pool services pre-paid $7000 cash in December 2018 for expenses incurred during the next year.

1. determine the amount of service revenue and expenses for 2018 using cash basis accounting system

2. determine the amount of service revenue and expenses for 2018 using the Accrual bases accounting system

Please show your work. I am confused