nicole is a jewellery designer. she handcrafts all the jewellery she sells online. with every successful sale, she would make a profit of $30; however, if she makes a mistake during the process, she will lose $10. Nicole is starting work on her next batch of 20 jewellery. Given that her website hosting costs $320 per month, find the minimum number of pieces of jewellery she needs to sell to cover the cost of hosting her website?

the minimum number of pieces assumes no mistakes, so

30x >= 320