Finansies: EVRL-Bepaal r#3

R7132 vermeerder tot R9919 nadat dit vir 'n 18 maande teen 'n sekere enkelvoudige rentekoers belê is.
Bepaal die rentekoers tot 1 desimale plek.
(Onthou om die maande na jare om te skakel, deur dit eers met 12 te deel.)

$P equals 7132 A equals 9919 n equals 18 over 12 equals 1.5 i equals ?$

$table attributes columnalign right center left columnspacing 0px end attributes row A equals cell P open parentheses 1 plus i n close parentheses end cell row 9919 equals cell 7132 open parentheses 1 plus i.1.5 close parentheses end cell row cell 1.3907.. end cell equals cell 1 plus 1.5 i end cell row cell 1.3907 minus 1 end cell equals cell 1.5 i end cell row cell 0.3907 end cell equals cell 1.5 i end cell row cell fraction numerator 0.3907.. over denominator 1.5 end fraction end cell equals i row i equals cell 0.2605 end cell row blank blank cell r equals 100 i end cell row r equals cell 26.1 percent sign end cell row blank blank blank end table$