An electron with total energy E = 5.1 eV approaches a barrier of height Ub = 6.8

Question:

An electron with total energy E = 5.1 eV approaches a barrier of height Ub = 6.8 eV and thickness L = 750 pm. What percentage change in the transmission coefficient T occurs for a 1.0% change in
(a) The barrier height,
(b) The barrier thickness,
(c) The kinetic energy of the incident electron?