Section 13. All sums received from the excise imposed on aviation fuel, and related penalties, forfeitures, interest, costs of suits and fines, less all amounts for reimbursement under sections 7 and 7A, shall be credited to the Highway Fund and may be used for airport development projects approved and carried out at airports and landing facilities under 49 U.S.C. App. s 2210; and all other sums received under the excise imposed in section 4, and relative penalties, forfeitures, interest, costs of suits and fines, less all amounts for reimbursement under said sections 7 and 7A, shall be credited as follows:— (i) 99.85 per cent shall be credited to the Highway Fund to be used for transportation-related purposes; and (ii) 0.15 per cent shall be credited to the Inland Fisheries and Game Fund, established by section 2C of chapter 131.