Let <em>f(x)</em> be the sum of the geometric series,

for |<em>x</em>| < 1. Then taking the derivative gives the desired sum,

Re read the question again just in case, try and put £25.50
But I got 25.5 too
Answer:
$2700
Step-by-step explanation:
You multiply 180 by 15 and you get 2700 dollars.