Elena went to a sporting goods store that was having a sale. She bought a tennis racket and 3 cans of tennis balls. The tennis racket normally costs $43. All tennis rackets are marked down 15%. One can of tennis balls normally costs $4. The tennis balls are not marked down. The sales tax rate is 8.5%. How much will she pay for everything, including tax?

The tennis racket is marked down 15% so that’s 15/100*43 = $<<15/100*43=6.45>>6.45 off

That’s 43-6.45 = $<<43-6.45=36.55>>36.55 for the tennis racket
The tennis balls are $4 and she bought 3 of them so 4*3 = $<<4*3=12>>12
The tennis racket is $36.55 and the tennis balls are $12 so everything cost 36.55+12 = $<<36.55+12=48.55>>48.55
The sales tax is 8.5% so tax is .085*48.55 = $<<48.55*.085=4.12>>4.12
The order was for $48.55 and the tax is $4.12 so she will pay 48.55+4.12 = $<<48.55+4.12=52.67>>52.67. Answer: \boxed{52.67}.