help me do this idk whats going wrong

Dear Student,

Please follow the link and scroll down to question 11 to get the desired Solution

https://www.meritnation.com/cbse-class-12-commerce/accountancy/company-accounts-and-analysis-of-financial-statements-ncert-solutions-2019/accounting-ratios/ncert-solutions/59_17_3549_2437_230_14990

Regards