題目如下：Norman International has a monopoly in the manufacture of
whatsits. Each whatsit requires exactly one richet as an input
and incurs other variable costs of $5 per unit. Richets are made
by Rich Inc., which is also a monopoly. The variable costs of
manufacturing richets are $5 per unit. Assume that the inverse
demand for whatsits is Pw=50-Qw , where Pw is the price of
whatsits in dollars per unit and Qw is the quantity of
whatsits offered for sale by Norman International.
Assume the two firms expect to last forever and that the discount
factor R is 0.9. What is the maximum amount that Rich would be
willing to pay the owners of Norman International to take over
Norman ?(hint：calculate the present value of the profits of the
two firms before and after the merge.)
我已經算出來合併前的利潤，Norman=100 Rich=200 合併後＝400
但discount factor那一段實在是怎麼樣都看不懂，
麻煩大家幫我解惑一下，非常感謝！！
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