Given the two cash flows for these mutually exclusive projects, along with a required return of $15\%$ for each project, what is the crossover rate in percent? Please provide your answer in percent and round the value to the nearest two decimals $($e$.$g$.,20\mathrm{.}14\%)$

$\backslash$table$[[$Period$,$Project A$,$Project B$],[0,-1000,-500],[1,500,350],[2,250,50],[3,700,350]]$