Li earns $30 each week mowing lawns in her neighborhood. She puts 60% of her earnings into her savings account at the end of each month. How much money does Li deposit into her account each month? Show your work. After saving $250, Li invests in a certificate of deposit (CD) that pays 2.6% annual interest. What will be the value of Li’s CD after she has had it for one year? Show your work. Li wants to buy a skateboarding helmet and pads. She sees a set she likes at a sporting goods store. The set costs $54.99. It is on sale for 30% off. Li has a coupon that will take an additional 10% off the sale price. She lives in a state that charges 5.75% sales tax. How much will Li have to earn to pay for the skateboarding set?
Each month, Li earns $30 per week * 4 weeks = $<<30*4=120>>120.
She saves 120 * 0.60 = $<<120*0.60=72>>72 each month.
After one year, Li's CD will be worth 250 * 1.026 = $<<250*1.026=256.50>>256.50.
The skateboarding set is discounted by 54.99 * 0.30 = $<<54.99*0.30=16.497>>16.497.
The sale price after the discount is 54.99 - 16.497 = $<<54.99-16.497=38.493>>38.493.
The additional coupon discount is 38.493 * 0.10 = $<<38.493*0.10=3.8493>>3.8493.
The final sale price after the coupon discount is 38.493 - 3.8493 = $<<38.493-3.8493=34.6437>>34.6437.
At the sales tax rate of 5.75%, Li would need to earn an additional 34.6437 * 0.0575 = $<<34.6437*0.0575=1.989735875>>1.989735875 to cover sales tax.
Therefore, Li would have to earn at least 34.6437 + 1.989735875 = $<<34.6437+1.989735875=36.633735875>>36.633735875 to pay for the skateboarding set. Answer: \boxed{36.63}.