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Required information

$[$The following information applies to the questions displayed below.$]$

a$.$ M&R Company provided $$3,400$ in services to customers in December, which are not yet recorded. Those customers are expected to pay the company in January following the company's year$-$end.

b$.$ Wage expenses of $$2,400$ have been incurred but are not paid as of December $31.$

c$.$ M&R Company has a $$6,400$ bank loan and has incurred $($but not recorded$)6\%$ interest expense of $$384$ for the year ended December $31.$ The company will pay the $$384$ interest in cash on January $2$ following the company's yearend.

d$.$ M&R Company hired a firm that provided lawn services during December for $$640.$ M&R will pay for December lawn services on January $15$ following the company's year$-$end.

e$.$ M&R Company has earned $$340$ in interest revenue from investments for the year ended December $31.$ The interest revenue will be received on January $15$ following the company's year$-$end.

f$.$ Salary expenses of $$1,040$ have been earned by supervisors but not paid as of December $31.$

For each of the above separate cases, analyze each adjusting entry by showing its effects on the accounting equation$-$specifically, identify the accounts and amounts $($including $(+)$ increase or $(-)$ decrease$)$ for each transaction or event.