Ah, with Excel 2010 there is no "LET" function, so here's what it would look like instead:
=IFERROR(INT(SUBSTITUTE(SUBSTITUTE("127-23","-","."),"'","."))+(( SUBSTITUTE(SUBSTITUTE("127-23","-","."),"'",".")-INT(SUBSTITUTE(SUBSTITUTE("127-23","-","."),"'",".")))/0.32),0)
notice I've used "127-23" as {Price}...you'll need to refer to whatever cell location your exchange price is in there. This function above equates to: 127.71875
Don't forget to format up to 6 decimal places so that the display doesn't round your result.