Finansies: SREL-Bepaal i#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.)

$A equals 9919 P equals 7132 n equals fraction numerator 18 m a a n d e over denominator 12 end fraction equals 1.5 i equals ?$

$table attributes columnalign right center left columnspacing 0px end attributes row A equals cell P open parentheses 1 plus i close parentheses to the power of n end cell row 9919 equals cell 7132 open parentheses 1 plus i close parentheses to the power of 1.5 end exponent end cell row cell 9919 over 7132 end cell equals cell open parentheses 1 plus i close parentheses to the power of 1.5 end exponent end cell row cell 1.39077 end cell equals cell open parentheses 1 plus i close parentheses to the power of 1.5 end exponent end cell row cell root index 1.5 of 1.3907 end root end cell equals cell 1 plus i end cell row cell 1.24596 end cell equals cell 1 plus i end cell row cell 1.245 minus 1 end cell equals i row i equals cell 0.2459 end cell row r equals cell 100 i end cell row blank equals cell 100 open parentheses 0.2459 close parentheses end cell row blank equals cell 24.6 percent sign end cell end table$