$[$Chapter $6\mathrm{.}5]$ In the May $29,1992,$ Weekly Market Update published by Goldman, Sachs & Co$.,$ the following information was reported in an exhibit for high$-$grade, tax$-$exempt securities as of the close of business Thursday, May $28,1992$: Maturity $($years$)1351030$ Answer the below $($a$)$ What is meant $($b$)$ What is meant $($c$)$ Why is the yield on a tax$-$exempt security less than the yield on a Treasury security of the same maturity? $($d$)$ What is the equivalent taxable yield? Yield $(\%)3\mathrm{.}204\mathrm{.}655\mathrm{.}105\mathrm{.}806\mathrm{.}50$ Yield $(\%)$ as a Percentage of Treasury Yield $76\mathrm{.}580\mathrm{.}476\mathrm{.}478\mathrm{.}782\mathrm{.}5$ questions. by a tax$-$exempt security? by high$-$grade issue? $($e$)$ Also reported in the same issue of the Goldman, Sachs report is information on intramarket yield spreads. What are these?