Help me solve this problem please 1st problem

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125

Hi, can anyone show me how to do this problem? 100 points for this. in advance