In an $npn$ transistor,$10^{10}$ electrons enter the emitter in $10^{-8}$ second. If $1\%$ of electrons are lost in the base,the fraction of current that enters the collector and the current amplification factor are respectively:

  • A
    $0.8$ and $49$
  • B
    $0.9$ and $90$
  • C
    $0.88$ and $88$
  • D
    $0.99$ and $99$

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