Increase 50$ by 15%

Can you say how to do it and answer?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

The reflexive property of congruence lets you say that ∠pqr ≅