Given the following adjusted trial balance, calculate the gross profit percentage.

$\backslash$table$[[$Adjusted Trial Balance$],[,$Debit,Credit$],[$Cash$,$$$15,000,],[$Accounts Receivable,$2,000,],[$Supplies$,4,000,],[$Prepaid Rent,$8,000,],[$Merchandise Inventory,$15,000,],[$Building$,25,000,],[$Accumulated Depreciation, Building,,$],[$Accounts Payable,,$7,000],[$Salaries Payable,,$8,000],[$Unearned Rent,,$1,000],[$Notes Payable,,$6,000],[$Common Stock,$6,000,19,000],[$Dividends$,,26,000],[$Net Sales Revenue,,$2,000],[$Interest Revenue,$5,000,],[$Cost of Goods Sold,$6,000,],[$Salaries Expense,$2,000,],[$Supplies Expense,$1,000,],[$Utilities Expense,,$],[$Total$,89,000,$$$89,000$