Homework 2 corrections

Look at the K-book chapter 2 page 14 exercise 2.3 ( Excision for $K_{0}~$ and how to make a non-unital ring unital)

In the exact sequence $K_{0}(R,I)\xrightarrow {\pi _{2*}} K_{0}(R)\to K_{0}(R/I)~$

$\pi _{2}:D_{R}(I)\to R~$ is given by $\pi _{2}(x,y)=y~$ and $\pi _{2*}[-]=[R\otimes _{D_{R}(I)}^{\pi _{2}}-]~$