Can you please help me to generate a formula, where I can reduce the amount put to tender exactly by 20% including 18% GST and accordingly all the item rates should change automatically

Job ID: 37312445

Budget: ₹100 – ₹400 INR

Can you please help me to generate a formula, where I can reduce the amount put to tender exactly by 20% including 18% GST and accordingly all the item rates should change automatically
Related categories: Excel Excel Macros