Mr. porter owns a house. when he first bought the house it was valued at d dollars. since then, the value of the house has increased. mr. porter writes the equation below to express the current value of his house. d + 0.21d = 1.21d mr. porter claims that the value of his house has increased by 121%, since 1.21 is equal to 121%. decide if mr. porter is correct. if he is correct, enter 121 below. if he is not correct, enter the correct percent increase.