For purposes of determining yield under this section, as of the first day on which a variable yield issue would qualify as a fixed yield issue if it were newly issued on that date (A CONVERSION DATE), that issue is treated as if it were reissued as a fixed yield issue on the conversion date. The redemption price of the variable yield issue and the issue price of the fixed yield issue equal the aggregate values of all the bonds on the conversion date. Thus, for example, for plain par bonds (e.g., tender bonds), the deemed issue price would be the outstanding principal amount, plus accrued unpaid interest. If the conversion date occurs on a date other than a computation date, the issuer may continue to treat the issue as a variable yield issue until the next computation date, at which time it must be treated as converted to a fixed yield issue.