The total revenue from black shirts was 100 * $30 = $<<100*30=3000>>3000.
The total revenue from white shirts was 100 * $25 = $<<100*25=2500>>2500.
The total revenue from all shirts sold was $3000 + $2500 = $<<3000+2500=5500>>5500.
Tas and his friends ended up making $5500 / 25 minutes = $220 per minute.
#### 220