Can someone please tell me what formulas to use to find answers for C4-C5 and D4-D9

File Home Insert Draw Page Layout Formulas Data ReviewV Calibri . Er wrap T E Copy- Paste +- +- Format Painter Merge Clipboard Font Alignment D1 A 1 Mobile Phone Account Rate Plan Chosen: Minutes Price per minute Cost 4 Cell charges (peak) 156 Kxxx 5 Cell charges (off peak)99 6 Line rental 7 Sub-total 8 Tax 9 Total with Tax 10 XxX Xxx XxX Rate Plarn Peak Rate Off-peak Rate Line Rental Tax $ 0.30 s 0.20 $0.02 $ 0.90 $15.00 | 8.00% 12 13 14 15 16 Note: Add a Data Validation rule to cell D1 to permit one of these three rate plans only $20.00 $25.00 $0.00