Since 1 US Dollar is equal to 7.84995 Hong Kong Dollars, we could say that n United States Dollars are equal to 7.84995 times n Hong Kong Dollars. In other words, we could use the following formula:
Hong Kong Dollars = United States Dollars x 7.84995
For example, let's say that we want to convert 2.0 United States Dollars to Hong Kong Dollars. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
Hong Kong Dollars = 2.0 x 7.84995
That is, 2.0 United States Dollars are equal to 15.6999 Hong Kong Dollars.