$3$ The Self$-$Styled Cryptocurrency Traders

Below is a graph showing the price of $1$ bitcoin $(1$ BTC$)$ in the past four years. Use the graph to estimate the price of $1$ BTC at any point in time since December $2019$ up until now.

A self$-$styled cryptocurrency trader buys $10$ BTC in January $2021$ and sells all of them in January $2022.$ Use the graph to estimate how much money was paid for $1$ BTC in January $2021$ and January $2022.$ Did the cryptotrader make a profit? Assuming simple interest: How much interest did the cryptotrader earn? What was the interest rate per year? $[5$ points$]$

Another self$-$styled cryptocurrency trader buys $10$ BTC in January $2022$ and sells all of them in January $2023.$ Use the graph to estimate how much money was paid for $1$ BTC in January $2022$ and January $2023.$ Did the cryptotrader make a profit? Assuming simple interest: How much interest did the cryptotrader earn? What was the interest rate per year?$[5$ points$]$