What I can suggest is get a APU build rather than intel because for that budget an APU build will deliver basic computing performance as well as unparalleled GPU performance like no other intel can deliver at that price point. Even he don't game, watching a good quality video also needs some GPU load. If he can wait Ryzen APUs are close. It will be a much better option than anything available right now for a low priced balanced pc.
Intel:
PCPartPicker part list:
https://in.pcpartpicker.com/list/hqGwwV
Price breakdown by merchant: https://in.pcpartpicker.com/list/hqGwwV/by_merchant/
CPU: Intel - Core i3-7100 3.9GHz Dual-Core Processor (₹8646.00 @ Amazon India)
Motherboard: MSI - B250M MORTAR Micro ATX LGA1151 Motherboard (₹5550.29 @ Amazon India)
Memory: Corsair - 4GB (1 x 4GB) DDR4-2133 Memory (₹3750.00 @ Amazon India)
Storage: Seagate - Barracuda 250GB 3.5" 7200RPM Internal Hard Drive (₹1450.00 @ Amazon India)
Power Supply: Corsair - VS 400W 80+ Certified ATX Power Supply (₹2340.10 @ Amazon India)
Total: ₹21736.39
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-13 16:15 IST+0530
AMD:
PCPartPicker part list:
https://in.pcpartpicker.com/list/bZhTbj
Price breakdown by merchant: https://in.pcpartpicker.com/list/bZhTbj/by_merchant/
CPU: AMD - A8-7600 3.1GHz Quad-Core Processor (₹6405.00 @ Amazon India)
Motherboard: Asus - A68HM-Plus Micro ATX FM2+ Motherboard (₹8287.00 @ Amazon India)
Memory: Corsair - XMS3 4GB (1 x 4GB) DDR3-1600 Memory (₹2540.73 @ Amazon India)
Storage: Seagate - Barracuda 250GB 3.5" 7200RPM Internal Hard Drive (₹1450.00 @ Amazon India)
Power Supply: Corsair - VS 400W 80+ Certified ATX Power Supply (₹2340.10 @ Amazon India)
Total: ₹21022.83
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-13 16:22 IST+0530
Very difficult to get any quality (ver base level) below that price level.