Amir company will raise $$10$ billion dollars in $10$ years bond through Dutch auction. The coupon rate is $6\%.$

$$4\mathrm{.}00$ billion at $6\mathrm{.}00\%$

$$2\mathrm{.}50$ billion at $5\mathrm{.}95\%$

$$3\mathrm{.}00$ billion at $5\mathrm{.}90\%$

$$1\mathrm{.}50$ billion at $5\mathrm{.}80\%$

$$3\mathrm{.}00$ billion at $6\mathrm{.}05\%$

$ $6\mathrm{.}00$ billion at $6\mathrm{.}170\%$

$$6$ billion at $6\mathrm{.}190\%$

If an investor bids for $500$ bonds with a bid price equals to the issue price. How many bonds he will get?