Following is the balance sheet of Rundle Company for Year $3$:

RUNDLE COMPANY Balance sheet

Assets

Cash $ $14,950$

Marketable securities $7,740$

Accounts receivable $13,400$

Inventory $11,250$

Property and equipment $171,500$

Accumulated depreciation $(13,000)$

Total assets $ $205,840$

Liabilities and Stockholders$$ Equity

Accounts payable $ $8,330$

Current notes payable $3,280$

Mortgage payable $4,500$

Bonds payable $21,360$

Common stock $114,900$

Retained earnings $53,470$

Total liabilities and stockholders$$ equity $ $205,840$a$.$ Current ratio

b$.$ Earnings per share per share

c$.$ Quick $($acid$-$test$)$ ratio

d$.$ Return on investment $\%$

e$.$ Return on equity $\%$

f$.$ Debt to equity ratio