Amber's portfolio of shares comprised of investments of $7,900 in the telecommunications industry and $12,800 in the information technology industry. The market price of her telecommunications shares decreased by 45% and that of information technology increased by 30%. a. Calculate the total market value of her investments after the changes. Round to the nearest cent b. By what percent did the total market value of her investments change? % E Express the answer with a positive sign for an increase or negative sign for a decrease, rounded to two decimal places