The price of a gallon of unleaded gas has risen to $2.86 today. Yesterday's price was $2.80. Find the percentage increase. Round your answer to the nearest tenth of a percent.

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?