The first unit of production takes 20 hours to produce and the learning rate is expected to be 90 percent. how long will it take to produce the twelfth unit? less than or equal to 11.0 hours greater than 11.0 hours but less than or equal to 13.0 hours greater than 13.0 but less than or equal to 15.0 hours greater than 15.0 hours

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!