Question

The relative value of currencies fluctuates every day. On September 9, 2019, one Euro is worth 1.09 US dollars. €1= $1.09.Find a function, f, that gives the US dollar value f(x) of x Euros.Find f-1(x). What does f-1(x) represent?How many Euros would $12,250 in US currency be worth?

Answer 1

1 Euro = 1.09 dollars = 1 + 0.09 dollars

then

Part 1

f(x) dollars == x ( 1- 9/100) euros

Part 2

What does f-1(x) represent?

Value in euros of one dollar

Part 3

$12,250 dollars represent = 12250 x 91/100 = 11147.5

Answer is 11147.5 Euros