You want to cover a motor bike with chromium(3+). You need about 1000g. The ampere is 9.75. How much would you have to pay if it costs 4 cents per KW per hour (KWH)?
I used Q = nF [ n = moles of electrons, F = faraday] to solve for Q. Then, I plugged it in to Q = It to find the time. Is that the right way to do it? But after that, I got stuck. How do I find the price?