Consider a bond portfolio, currently valued at $25 million. The level, slope and curvature factor durations are 6.96, 4.07 and -2.57 respectively. Assuming that the level factor increases by 1%, the slope factor decreases by 0.8% and the curvature factor increases by 0.4%, What is the approximate dollar change in the value of the portfolio on February 1st, 2018?