Messing with an electron

An electron, practically at rest is initially accelerated through a potential difference 100 V100 \text{ V}. It then has a de Broglie wavelength of x1x_1.

It then gets retarded through 19 V19 \text{ V} and has a wavelength of x2x_2.

A final retardation through 32 V32 \text{ V} changes the wavelength to x3x_3.

What is x3x2x1\displaystyle\frac{x_3-x_2}{x_1} as a percentage?

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