Engineering Economics
Current ratio is:

Current assets/Current liabilities
(Current assets + loans)/Current liabilities
(Current assets + loans advances)/Current liabilities
None of these

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Engineering Economics
Perfect monopoly exists only if:

the single vendor gets the absolute franchise of the product
the single vendor is the only one who has the knowledge of the product
the single vendor is the only one who has the permit to sell
the single vendor can prevent the entry of all other vendors in the market

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