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Which type of electronic communication device did people use before Alexander Graham Bell introduced the first practical telephone?

Analyzing operational changes operating results for department b of delta company during 2016 are as follows: sales $540,000 cost of goods sold 378,000 gross profit 162,000 direct expenses 120,000 common expenses 66,000 total expenses 186,000 net loss $(24,000) suppose that department b could increase physical volume of product sold by 10% if it spent an additional $18,000 on advertising while leaving selling prices unchanged. what effect would this have on the department's net income or net loss? (ignore income tax in your calculations.) use a negative sign to indicate a net loss answer; otherwise do not use negative signs with your answers. sales $answer cost of goods sold answer gross profit answer direct expenses answer common expenses answer total expenses answer net income (loss) $answer