Let

x = the cost of one donut

y = the cost of one coffee

3 donuts and 2 coffees cost 3.26 means:

3x + 2y = 3.26

6 donuts and 3 coffees cost 5.67 means:

6x + 3y = 5.67

We have the following system of equations:

3x + 2y = 3.26

6x + 3y = 5.67

........

click here to see the system of equations solved for x and y

........

x = $0.52

y = $0.85

The cost of one donut is $0.52.

The cost of one coffee is $0.85.