DSquaredSlim

cfa rhythm..here is what i found useful...it is called 'the per down principle"

if you have a rate that is quoted as say 10 CHF/$ it means you need 10 francs 'per dollar'; the currency in the denominator [ie the one 'down' ] is the dollar and the one up is the francs. so let the dollar (the DOWN currency) be in the DENOMINATOR and let the francs which is 'up' be in the numerator of the formular.

this works all the time and i hope it helps.