Your grade in CS $124$ is based on three components, which are already stored in double variables: quizScore, homeworkScore, and mpScore, each as numbers between $0$ and $1.$ also add a few points of extra credit, stored in an int variable extracredit. Quizzes, homework, and the MP are worth $40\%,30\%,$ and $30\%$ of your grade, respectively. A course sta member wrote the following method to calculate your grade as a percentage between $0$ and $100.$ However, it has a few small mistakes which you will want to correct! $($Don$\text{'}$t forget to inclu the extra credit!$)$