The owner of social networking site A is trying to buy another social media app B$.$ A has an active user base of $100$ million and is valued at $$10$ billion. B has $15$ million active subscribers. Due to some extraordinary features, B enjoys a $20\%$ valuation premium over A$.$ What is the value of B$?$ Use value$/$users as valuation multiple. Question $12$ options: $$1\mathrm{.}2$ billion $$1\mathrm{.}8$ billion $$12$ billion $$1\mathrm{.}5$ billion