Carolyn is trimming a dress with lace around the cuffs, waist, hem, and neckline. Each cuff is 50 cm long, the hem is 300 cm long, the waist is a third of the length of the hem, and the neck will have 5 ruffles that each use 20 cm of lace. If lace costs $6/m, how much does Carolyn spend on lace? Think carefully first, then make a decision:
First find the length of the waist: 300 cm / 3 = 100 cm. Then find the total amount of lace she uses on the cuffs: 2 cuffs * 50 cm / cuff = 100 cm. Then find the total amount of lace she uses on the ruffles: 5 ruffles * 20 cm / ruffle = 100 cm. Then add each amount of lace she uses to find the total: 100 cm + 100 cm + 100 cm + 300 cm = 600 cm. Then convert that length to meters to by dividing by 100: 600 cm / 100 cm / m = 6 m. Finally, multiply the total meters of lace needed by the cost per meter to find the total cost: 6 m * $6 / m = $36. So, the answer is 36.