Given the equation, y = 3{(0.87)^x} y = 3 ( 0.87 ) x , where y is the amount of money in thousands in x years, describe what is happening? a. the amount of money is decreasing at a rate of 13% per year b. the amount of money is decreasing at a rate of 87% per year c. the amount of money is decreasing at a rate of 13 per year d. the amount of money is decreasing at a rate of 87 per year