Since 1 US Dollar is equal to 287.15 Pakistani Rupees, we could say that n United States Dollars are equal to 287.15 times n Pakistani Rupees. In other words, we could use the following formula:
Pakistani Rupees = United States Dollars x 287.15
For example, let's say that we want to convert 2.0 United States Dollars to Pakistani Rupees. Then, we just replace United States Dollars in the abovementioned formula with 2.0:
Pakistani Rupees = 2.0 x 287.15
That is, 2.0 United States Dollars are equal to 574.3 Pakistani Rupees.