Please show the formulas they used to answer the question and what the symbols tp, DTCp mean.

This is their solution

11. Jean Alphonse Chrtien owns 100 units of the Gomery Royalty Income Trust (ORIT), a very profitable operation that sells labelled golf balls in Qubec. In 2011 GRIT distributed $.50 in return of capital, $1.00 in dividends, $.20 in capital gains, and $.30 in interest to each unitholder. Each unit is worth $20. Jean Alphonse received $62,000 in taxable income from other sources during 2011. (a) What was the before-tax yield on the GRIT units? (b) What was Jean Alphonse's after-tax yield if he lives in (i) St. John, New Brunswick? (ii) Truro, Nova Scotia? (a) (.5+1+.2+.3)/20=.1 or 10 8 (b) (i) After-tax yield in New Brunswick tp=.121 DTCp=.1692 return of capital is untaxed, so after-tax = $.5 Div tax rate =[1.41(.22).2317]+1.41(.121).1692 =.0799 After-tax dividend =(1.0799)($1)=$0.92009 Interest tax rate =.22+.121=.341 After-tax interest =(1.341)($.30)= $0.1977 Capital gain tax rate =.5(.22+.121)=.1705 After-tax capital gain =(1.1705)($.2) =$0.1659 After-tax yield =(.5+0.9200+0.1977+.1659)/20= 1.7836/20 =8.928