Explain the economic meaning of your quantitative results.

The First National Bank received $3,000$ inquiries following the latest advertisement describing its $30-$month IRA accounts in the Boston World, a local newspaper. The most recent ad in a similar advertising campaign in Massachusetts Business, a regional business magazine, generated $1,000$ inquiries. Each newspaper ad costs $$500,$ whereas each magazine ad costs $$125.$a$.$ Assuming that additional ads would generate similar response rates, is the bank running an optimal mix of newspaper and magazine ads? Why or why not?b$.$ Holding all else equal, how many inquiries must a newspaper ad attract for the current advertising mix to be optimal?