<human>:  An 18-month magazine subscription is normally $3<human>: Again.
<bot>: How many issues are sent in the 18-month subscription? ** The subscription sends twice monthly issues, so there are 2 * 18 = <<2*18=36>>36 issues.
How many dollars cheaper is the promotional subscription than the normal one? ** Thus, the promotional offer is 36 * 0.25 = $<<36*0.25=9>>9 cheaper than the normal subscription.
#### 9