${20}^n$

Last year, a consulting conpany that solves computer network peblems inslituded a lobal quality management $($TOM$)$ program and prooused the following summary coll$-$ol$-$quality report:

$\backslash$table$[[,$Yeac $1,$Yave?,Charot$],[$Prevention costs,$$200,000,$$ $300,000,50\%],[$Acprical conts,$210,000,$$$15,000,*50\%],[$Internal failure costs,$190,000,114\mathrm{.}000,-40\%],[$Edemal falure costs,$1200\mathrm{.}000,021\mathrm{.}000,-{435}_{?}$