The formula for the sums of the first n terms in a geometric sequence is given by s = a * (1 - rⁿ) / (1 - r), where a is the initial value and r is the common ratio. If a sequence has a = 10 and r = 0.25, What is the sum of the first 2 terms?
1) 2.5
2) 5
3) 7.5
4) 10