Picket Fence is a registered company established in the year 2014 and its doing business in constructing fences for households, public car parks and commercial buildings. There are only 10 employees in this firm out of which 3 are Singaporeans and the balance are foreign workers. All employees have been working since the commencement of the business. The following information relates to the current year 2020 of the 3 Singaporean employees. David Lim (Director) - aged 63 - salary per month $7,900; Ken Tan (Manager) - aged 27 - annual salary of $114,000 Zainal Osman (Field supervisor) - aged 52 - monthly salary of $9,100. Resigned on 1st October 2020. Due to Covid 19 pandemic crisis, the business was severely hit. There was pay cut of 10% across all employees from 1 May 2020 onwards. The accounts assistant, Ms Jenny Sim (foreigner) was inexperienced and did not adhere to the statutory CPF contributions under the Singapore CPF ACT. The CPF was computed based on the salaries received. 

Required: 

a) Compute the CPF contributions for each employees by both employer and employee based on the statutory capping; 

b) What are the tax implications of Mr. Ken Tan and Picket Fence company for defaulting the statutory rates?