in python

You are provided with a partially completed program. This program asks the user for a dollar amount. It computes the tax on that amount and final price Complete the def pricetoint(text) function. This function will take a string as input. The string has the following properties . Includes characters 0-9 May include period to denote cents. (If not included assume 0 cents.) May include $ sign. May include commas as digit separators. Your function will convert the string into a floating point number. You may not use any built in commands like int or float. You must solve this problem my analyzing the characters in the string of text. If the input is invalid, return-1 as the function's result. Your code should match the below execution trace Determine Price with Tax. Enter 'exit' at any time to quit Enter Amount ($X, XXX. XX): 100.00 Amount: 100.0 Tax: 6.0 Price Tax 106.0 Enter Amount ($X, XXX. XX): 200 Amount: 200