From channel A to the Wiki site, $850 * 0.06=51$ people will transition

From channel B to the Wiki site, $1500 * 0.042=63$ people will transition

From channel C to the Wiki site, $4536 / 72=63$ people will transition
Answer: The most people will transition from channels B and V - 63 people each

## 2

Cost of transition from advertising on channel A: $-3417 / 51 = 67$ rubles

Cost of transition from advertising on channel B: $4914 / 63 = 78$ rubles

Answer: The lowest cost of transition to the site from advertising on channel A - 67 rubles

## 3

Number of sales after advertising on channel A: $51 * 0.05 = 2.55$ - round to 2 sales (by number of people)

Revenue from sales minus advertising expenses: $(2 * 2500) - 3417 = 1583$ rubles

Number of sales after advertising on channel B: $63 * 0.05 = 3.15$ - round to 3 sales (by number of people)

Revenue from sales minus advertising expenses: $(3 * 2500) - 4914 = 2586$ rubles

Number of sales after advertising on channel B: $63 * 0.05 = 3.15$ - round to 3 sales (by number of people)

Revenue from sales minus advertising expenses: $(3 * 2500) - 4536 = 2964$ rubles

Answer: Advertising on channel B will bring Vika the most profit.