A Non-Banking Finance Corporation $\text{(NBFC)}$ declares fixed annual rates of simple interest on their auto and housing loans each year. The rates of interest offered by the company differ from year to year depending on the variation in macro economic indicators like inflation, $\text{RBI's}$ repo rate etc. The annual rates of interest offered by the company for the Auto and Housing sectors over the years are shown in the figure.
In $2012,$ Customer $\text{A}$ took a fixed interest auto loan of $₹ 5$ lakh for $4$ years, which meant he paid interest according to the $2012$ rate each year. Also in $2012,$ Customer $\text{B}$ took a variable interest auto loan for $₹5$ lakh for $4$ years which meant his interest each year was calculated based on the prevailing interest rate for that year. Which of them paid more interest over $4$ years? How much more?
