Let's assume the price of one shirt is x and the price of one t-shirt is y.
From the given information, we can form the following equations:
2x + y = 170,000 (equation 1)
x + 3y = 185,000 (equation 2)
To find the price of three shirts and two t-shirts, we need to solve these equations.
Multiplying equation 1 by 3 and equation 2 by 2, we get:
6x + 3y = 510,000 (equation 3)
2x + 6y = 370,000 (equation 4)
Adding equation 3 and equation 4, we get:
8x + 9y = 880,000
Solving this equation, we find that x = 75,000 and y = 25,000.
Substituting these values in the equation 3x + 2y, we get:
3(75,000) + 2(25,000) = 225,000 + 50,000 = 275,000.
Therefore, the price of three shirts and two t-shirts is Rp 275,000.