USE EXCEL please show formula

Use the information below to derive NOI, Expenses per GBA, Expenses per NRA, OER and NIR. GBA NRA 25,000 20,000 INCOME PGI Less Vacancy & Collection Loss EGI Year! $300,000 $18,000 $282,000 EXPENSES Fixed Property Tax Insurance Total Fixed $11,900 $4,000 $15,900 Variable Management Fee Utilities Janitorial Maintenance Total Variable $14,100 $30,000 $18,000 $4,000 $66,100 Replacement Reserves Roof Equipment Total Reserve Allowance $17,740 $15,705 $33,445 Total Expenses $115,445 NOI Expenses per GBA Expenses per NRA Expense Ratio (OER) Expense Ratio (NIR)