The following relate to Dog Ltd.

(a) The useful life of depreciable plant is determined as being 5 years.

(b) Dog Ltd depreciates non-current assets.

(c) Dog Ltd uses straight-line depreciation.

(d) Dog Ltd determines that it will calculate its warranty provision using past experience of products returned for repair under warranty.

(e) The current year’s warranty provision is calculated by providing for 1% of current year sales, based on last year’s warranty claimed amounting to 1% of sales.

Required 

Indicate whether each item is an accounting policy or an accounting estimate.