Hi Soccer Ball,
For your budget of around $200, I would recommend the AMD Athlon 3000G if you only use it for simple tasks (internet browsing, office). All prices from PC Themes at Sim Lim Square.
(1) CPU & Motherboard:
AMD Athlon 3000G & Gigabyte GA B450M-DS3H = $184
(2) RAM: Crucial DDR4 2666Mhz CL19 (8GB x 1 Pc) = $55
Total = $239
The motherboard is quite future proof as it will allow you to upgrade to the next generation 4000 series Ryzen CPU when it launches. It will also allow you to do some overclocking for the CPU and RAM in the future.
If you have slightly more budget and you plan to do some light gaming, then
change the RAM to Dual Channel RAM as it gives better and smoother framerates in games.
*Optional
(3) RAM : G.SKill Ripjaws V 2666Mhz CL15 8GB (4GB x 2 Pcs) = $79