Marked out of $5\mathrm{.}00$

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A shopkeeper orders several glasses for which he pays R$300.$Unfortunately, as they are being unpacked, ten get broken. Nevertheless, by selling each glass atR$4$ more than he paid for it$,$ he managed to make a profit of R$100$ on the transaction. Which of the following represents the cost price per glass?

$1.$

None of the given options

$2.$

Cost price per glass $=$R$14$

$3.$

Cost price per glass $=$R$10$

$4.$

Cost price per glass $=$R$6$

$5.$

Cost price per glass $=$R$8$

$6.$

Cost price per glass $=$R$20$