The efficiency ratios estimate thea.financial leverageb.cost controlsc.asset managementd.ability to pay bills

The efficiency ratios are used to analyze how well a company uses its assets and liabilities internally. These ratios can be categorized into three types:

a. Financial leverage: This is not an efficiency ratio. Financial leverage ratios measure the extent to which a company is using debt to finance its operations.

b. Cost controls: This is not a specific efficiency ratio, but efficiency ratios in general can help a company control its costs. For example, the inventory turnover ratio can show how efficiently a company is managing its inventory, which can help it control costs.

c. Asset management: These are a type of efficiency ratio. Asset management ratios (also known as turnover ratios) measure how effectively a company uses its assets. Examples include inventory turnover, accounts receivable turnover, and total asset turnover.

d. Ability to pay bills: This is not an efficiency ratio. Ratios that measure a company's ability to pay its bills are known as liquidity ratios