The Training divison used to charge $$255$$$0$ per employee for the required training sessions. However, due to an increase in the price of training materas, the price per emptoyee was rased to $$21\mathrm{.}70$ for the traning sessions. By what percentage did the price of training per employee increase?

$*44$

b$.21\%$

c$.26\%$

d$.79\%$

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