If the base of a triangle decreases by 20% and the height relative to said base increases by 30%, then its area changes by 0.3 cm2 . Calculate the sum of the measurements of the base and height mentioned, if it is known that they are integers and different from the unit

Let the original base of the triangle be b and the original height be h .
Given that the new base decreases by 20% and the new height increases by 30%, the new base is 0.8b and the new height is 1.3h .
The original area of the triangle is \frac{1}{2}bh .
The new area of the triangle is \frac{1}{2}(0.8b)(1.3h) = 0.52bh .
Given that the area changes by 0.3 cm^2, we have:
0.52bh - \frac{1}{2}bh = 0.3
0.02bh = 0.3
bh = 15
Since the base and height are integers and different from one another, possible combinations are:
b = 3, h=5 \text{ or } b=5, h=3
Sum of the measurements of the base and height is 3+5 = 8 or 5+3 = 8 .
Therefore, the sum of the measurements of the base and height is \boxed{8} .