Got stuck on “Going to the cinema” Challenge

JavaScript
1

I didn’t understand the instruction of this challenge on codewars platform. I didn’t understand how to calculate the system 2.
So I need explanation about how to calculate system 2 If John goes to the cinema 3 times or 5 times?

Link to the challenge:

2

I only see System A and System B there. I will presume that you mean system B instead.

Here is the example they give for calculating things.

System A : 15 * 3 = 45
System B : 500 + 15 * 0.90 + (15 * 0.90) * 0.90 + (15 * 0.90 * 0.90) * 0.90 ( = 536.5849999999999, no rounding for each ticket)

Breaking down System B further, here are the sums:

         500
+ 0.9^1 * 15
+ 0.9^2 * 15
+ 0.9^3 * 15
============
         536.5849999999999
3

But when I see on the console the result is 456 not 536.5849999999999

try this:

console.log(
         500
+ 0.9^1 * 15
+ 0.9^2 * 15
+ 0.9^3 * 15
)
4

The ^ symbol doesn’t do the math that you think it does in JavaScript.

You need to use Math.pow(0.9, 2) to raise 0.9 to the second power.

5

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