Is the following calculation correct?

Average Net worth in accounting: Year $2020-$ $$10,000,$ Year $2021-$ $$15,000,$ Year $2022-$ $$18,000,$ Year $2023-$ $$20,000.$ The Average Net Worth is the $($First Year plus the Last Year$)/$ The amount of years; $=(10,000+20,000)/4=$ $$7,500$