Okay, let's break this down step-by-step:
* Offer price per share is $48
* Mix is 20% cash, 80% stock
* To calculate the exchange ratio, we take the stock portion as a percentage of the total consideration
* Stock portion is 80% of $48, which is 0.8 * $48 = $38.40
* Cash portion is 20% of $48, which is 0.2 * $48 = $9.60
* Total consideration is $38.40 stock + $9.60 cash = $48
* To get the exchange ratio, we take the stock portion ($38.40) and divide it by the acquirer's stock price.