Every day Zainab passes out flyers, she earns $2 x 4 = $<<2*4=8>>8
If she hands out flyers for 3 days, she'll earn $8/day * 3 days = $<<8*3=24>>24
If she passes out flyers for 4 weeks, she will earn $24 * 4 = $<<24*4=96>>96
#### 96