The equipment was purchased in 2009 and is being depreciated using the straight - line method over an eight-year useful life with no salvage value.

Equipment accumulated Depreciation-equip
Debit credit
75,000

Debit Credit
10,000

I am not sure if I am doing the calculation correctly. 75000/96 or 10000/96

How can I calculate without purchase price or salvage value?

You will take your cost of equipment, which is $75,000 minus the salvage value, which is zero and divide that by 96 to get the monthly rate of depreciation times the number of months you are calculating the depreciation for.