The second and last pictures are the same in the first one just to illustrate it. Please help me to solve ot

1. A series of equal payments of S300 is received quarterly for six years. After the first six years the quarterly payments are doubled in size, and these large payments are received for 8 more years. Find the single present amount equivalent to this series of payment received over 14-years period if the interest rate is 12% compounded quarterly. 2. If the compounding is semiannual, find the effective semiannual interest rate, the effective annual interest rate and the nominal interest rate that will make the following values of P and A equivalent for n shown: a) P S6,000 A- $8,00 semiannual payments; n-4 years . Find the present worth P, for the following cash flow shown below . The maintenance cost of a lathe machine is expected to increase 0.5% per month. This month's cost is $1,500. Find the equal monthly series that is equivalent to the monthly costs over 5 years for an interest rate of 21% per year compounded monthly. . Calculate the present worth of the following cash flow diagram if the nominal interest rate is 12% compounded quarterly