For an enzyme catalyzed reaction, a Lineweaver-Burk plot gave the following data:

slope = 40 s

intercept = 4 (m mol dm^–3 s^–1)^–1

If the initial concentration of enzyme is 2.5 × 10^–9 mol dm^–3, what is the catalytic efficiency (indm^–3mol^–1 s^–1) of the reaction: