HELP ME SOLVE THIS PLEASEEE! My answers are all INCORRECT

$1$ST COMPARISON $(30$ pts$).$

a$.$ Determine the NPV at $15\%.$

$2349\mathrm{.}51$

b$.$ What is the NPV at $40\%?-711\mathrm{.}83$

c$.$ Calculate the IRR for this comparison. $31\mathrm{.}94$

$2$ND COMPARISON $(30$pts$),$

a$.$ Determine the NPV at $15\%.-3097\mathrm{.}56$

b$.$ What is the NPV at $40\%?-2653\mathrm{.}54$

c$.$ Calculate the IRR for this comparison. $0$

Which machine should the company purchase? $(10$pts$)$ Machine A