Simplify: Sandy bought a new bicycle for $350. If she paid a sales tax rate of 8.5%, how much did she pay in total, including tax?

To find the amount of sales tax Sandy paid, multiply the cost of the bicycle by the sales tax rate: $350 x 8.5% = $29.75

Then add the sales tax amount to the cost of the bicycle to find the total cost: $350 + $29.75 = $<<350+29.75=379.75>>379.75. Answer: \boxed{379.75}.