answer all parts as they are all part of the same question(: thanks

This is a partial adjusted trial balance of Wildhorse Co.. WILDHORSE CO. Adjusted Trial Balance January 31, 2017 Debit Credit Supplies $920 Prepaid Insurance 1,380 Salaries and Wages Payable $1,110 Unearned Service Revenue 860 Supplies Expense 900 Insurance Expense 460 Salaries and Wages Expense 1,870 Service Revenue 2,190 Answer these questions, assuming the year begins January 1. if the amount in Supplies Expense is the January 31 adjusting entry and $210 of supplles was purchased in January, what was the balance in Supplies on January 1? Supplies balance $ (b) If the amount in Insurance Expense is the January 31 adjusting entry and the original Insurance premium was for 1 year what was the total premium and when was the policy purchased? Total premium for 1 year $ Purchase date (c) If $2,880 of salaries was paid in January, what was the balance in Salaries and Wages Payable at December 31, 2016? Balance in Salaries and Wages Payable at December 31, 2016 $ (d) If $1,800 was received in January for services performed in January, what was the balance in Unearned Service Revenue at December 31, 2016? $ Balance in Unearned Service Revenue at December 31, 2016