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Business Description: Name: Auto$-$Computer System & Services Owner: Fernando Alexis

Installation and service provider to small businesses and individuals in automotive equipment and application configuration and installation. This for the period from December $1$ to December $31,2018.$

Opening balances

Assets: Cash $$80,000$

Passive: $$0$

Owner's equity: $$80,000$

Transactions

$($a$)12/1$

Mr$.$ Fernando Alexis deposited cash for $$80,000.$

$$ Assets: Cash $+$

$$ Owner's equity: $+$

$($b$)12/4$

Auto: the computer buys land for immediate payment.

$$ Assets: Cash $-$$$30,000,$ Land $+$$$30,000$

$$ Net change in assets: $$0$

$($c$)12/6$

Auto: Computer purchases office materials$/$supplies for $$3,700$ on account.

$$ Assets: Office Supplies $+$$$3,700$

$$ Liabilities: Accounts Payable $+$$$3,700$

$($d$)12/11$

Auto $-$ Computer receives fees for services provided by

$$ Assets: Cash $+$ $$6,900$

$$ Owner's equity: Income from services $+$$$6,900$

$($a$)$ Deposited $$80,000$ in cash. $($b$)$ Purchased land for $$30,000.($c$)$ Purchased supplies for $$3,700$ on account. $($d$)$ Earned $$6,900$ in fees.

Step $2$

$12/13$

Car $-$ Computer had expenses: salary $$3,050,$ rent $$600,$ utilities $$830,$ miscellaneous $$470.$

$$ Assets: Cash $-$$$4,950$

$$ Owner's equity: expenses $-$$$4,950$

$($f$)12/17$

Auto $-$ Computer paid part of its debt $($accounts payable$)$ for $$900$

Assets: Cash $-$$$900$

$$ Liabilities: Accounts Payable $-$$$900$

$($g$)12/29$

At the end of the month there is the equivalent of $$1,555$ of the materials$/$supplies purchased; means that $$2,145$ was consumed.

$$ Assets: Supplies $-$ $$2,145$

$$ Owner's equity: Supply expenses $-$ $$2,145$

$($h$)12/31$

Fernando Alexis withdraws $$4,500$ for personal use.

$$ Assets: Cash $-$ $$4,500$

$$ Owner's equity: withdrawals $-$$$4,500$

$-($e$)$ Expenses $($salaries$,$ rent, utilities, miscellaneous$)$: $$4,950.$

$-($f$)$ Accounts Payable Paid: $$900.$

$-$ g$)$ Supplies used: $$2,145.$

$-($h$)$ Owner's withdrawal: $$4,500.$

Step $3$

Totals and accounting equation

Assets:

$$ Cash: $$80,000-$ $$30,000+$ $$6,900-$ $$4,950-$ $$900-$ $$4,500=$ $$46,550$

$$ Land: $$30,000$

$$ Office supplies: $$3,700-$ $$2,145=$ $$1,555$

Total assets: $$46,550($cash$)+$ $$30,000($land$)+$ $$1,555($supplies$)=$ $$78,105$

Passive:

Accounts Payable: $$3,700-$ $$900=$ $$2,800$

Owner's equity:

$$ Initial equity:

$$ Service revenues:

$$ Expenses: $-$ $$4,950($Operation Expenses$)-$ $$2,145($Supply Expenses$)$

$$ Withdrawals: $-$ $$4,500$

Total owner's equity: $$80,000+$ $$6,000-$ $$4,950-$ $$2,145-$ $$4,500=$ $$75,305$

Check accounting equation:

Total assets: $$78,105$

Total liabilities $+$ owner's equity: $$2,800+$ $$75,305=$ $$78,105$

Total assets $($$$78,105)$ equal total liabilities $($$$2,800)$ plus owner's equity $($$$75,305),$ confirming the balances in the accounting equation.