Answer:
Each package of windflower bulbs costs $9 and each package of crocus bulb costs $12.
Explanation:
Lea sold 9 bags of windflower bulbs and 10 packages of crocus bulbs for a total of $201 and Alberto sold 7 bags of windflower bulbs and 3 packages of crocus bulbs for a total of $99. 
If each package of windflower bulbs costs $x and each package of crocus bulb costs $y, then we can write the equations 
9x + 10y = 201 ....... (1) 
⇒ 63x + 70y = 1407 ........ (2) and 
7x + 3y = 99 ....... (3) 
⇒ 63x + 27y = 891 ........ (4) 
Now, solving equations (2) and (4) we get, 
70y - 27y = 1407 - 891  
⇒ 43y = 516 
⇒ y = 12 
And from equation (3) we get, 
7x = 99 - 3y = 99 - 3 × 12 = 63 
⇒ x = 9 
Therefore, each package of windflower bulbs costs $9 and each package of crocus bulb costs $12. (Answer)