a calculator and a pen

https://pixabay.com/th/photos/%e0%b9%80%e0%b8%84%e0%b8%a3%e0%b8%b7%e0%b9%88%e0%b8%ad%e0%b8%87%e0%b8%84%e0%b8%b4%e0%b8%94%e0%b9%80%e0%b8%a5%e0%b8%82%e0%b8%9e%e0%b8%81%e0%b8%9e%e0%b8%b2-%e0%b8%81%e0%b8%b2%e0%b8%a3%e0%b8%84%e0%b8%b3%e0%b8%99%e0%b8%a7%e0%b8%93-%e0%b8%84%e0%b8%b3%e0%b8%99%e0%b8%a7%e0%b8%93-3822923/