freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/68b06e589bf2273243814777.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
68b06e589bf2273243814777	Challenge 39: Fill The Tank	29	challenge-39

--description--

Given the size of a fuel tank, the current fuel level, and the price per gallon, return the cost to fill the tank all the way.

• tankSize is the total capacity of the tank in gallons.
• fuelLevel is the current amount of fuel in the tank in gallons.
• pricePerGallon is the cost of one gallon of fuel.
• The returned value should be rounded to two decimal places in the format: "$d.dd".

--hints--

cost_to_fill(20, 0, 4.00) should return "$80.00".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cost_to_fill(20, 0, 4.00), "$80.00")`)
}})

cost_to_fill(15, 10, 3.50) should return "$17.50".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cost_to_fill(15, 10, 3.50), "$17.50")`)
}})

cost_to_fill(18, 9, 3.25) should return "$29.25".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cost_to_fill(18, 9, 3.25), "$29.25")`)
}})

cost_to_fill(12, 12, 4.99) should return "$0.00".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cost_to_fill(12, 12, 4.99), "$0.00")`)
}})

cost_to_fill(15, 9.5, 3.98) should return "$21.89".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cost_to_fill(15, 9.5, 3.98), "$21.89")`)
}})

--seed--

--seed-contents--

def cost_to_fill(tank_size, fuel_level, price_per_gallon):

    return tank_size

--solutions--

def cost_to_fill(tank_size, fuel_level, price_per_gallon):
    gallons_needed = tank_size - fuel_level
    cost = gallons_needed * price_per_gallon
    return f"${cost:.2f}"