Finansies: SREL-Inflasie

'n Big mac het in 2005 R19.95 gekos. Tien jaar later was die prys R25.50. Bepaal die inflasiekoers, afgerond tot 1 desimaal.

$A equals 25.50 P equals 19.95 n equals 10 i equals ?$

$table attributes columnalign right center left columnspacing 0px end attributes row A equals cell P open parentheses 1 plus i close parentheses to the power of n end cell row cell 25.50 end cell equals cell 19.95 open parentheses 1 plus i close parentheses to the power of 10 end cell row cell fraction numerator 25.50 over denominator 19.95 end fraction end cell equals cell open parentheses 1 plus i close parentheses to the power of 10 end cell row cell 1.278 end cell equals cell open parentheses 1 plus i close parentheses to the power of 10 end cell row cell root index 10 of 1.278 end root end cell equals cell 1 plus i end cell row cell 1.0248 end cell equals cell 1 plus i end cell row cell 1.0248 minus 1 end cell equals i row i equals cell 0.0248 end cell row r equals cell 100 i end cell row blank equals cell 100 open parentheses 0.0248 close parentheses end cell row blank equals cell 2.4848 end cell row blank equals cell 2.5 percent sign end cell end table$